Black Letter Law — Priority-Ranked Rule Book

Under 28 U.S.C. §1332, federal courts may hear state-law claims when there is complete diversity of citizenship and the amount in controversy exceeds $75,000. Complete diversity means no plaintiff may share state citizenship with any defendant. Diversity is assessed at the time the complaint is filed.

An individual is a citizen of the state of their domicile, meaning their present residence coupled with intent to remain indefinitely. A corporation is a citizen both of its state of incorporation and the state of its principal place of business (its nerve center). An unincorporated association, such as a partnership or LLC, takes the citizenship of each of its members.

The plaintiff's good-faith claim controls the amount in controversy unless it appears to a legal certainty that recovery cannot exceed $75,000. A single plaintiff may aggregate all claims against a single defendant. Multiple plaintiffs generally may not aggregate separate claims unless they assert a single, common, undivided interest.

Under 28 U.S.C. §1331, federal courts have jurisdiction over claims arising under federal law. Whether a case arises under federal law is governed by the well-pleaded complaint rule: the federal issue must appear on the face of the plaintiff's properly pleaded claim, not in an anticipated defense or counterclaim.

Under 28 U.S.C. §1367, a federal court with jurisdiction over an anchor claim may hear additional claims that form part of the same case or controversy, meaning they share a common nucleus of operative fact. In diversity cases, §1367(b) bars supplemental jurisdiction over certain claims by plaintiffs against parties joined under Rules 14, 19, 20, or 24 when doing so would defeat complete diversity.

A defendant may remove a case from state to federal court only if the federal court would have had original jurisdiction, and each defendant generally must do so within 30 days of receiving the initial pleading, with all defendants consenting. In diversity cases, removal is barred if any properly joined and served defendant is a citizen of the forum state (the in-state defendant rule), and a diversity case may not be removed more than 1 year after commencement absent bad faith. A case must be remanded if the federal court lacks subject-matter jurisdiction.

A court has personal jurisdiction over a defendant who is domiciled in the forum, is served while physically present in the forum (transient or tag jurisdiction), or consents. Beyond these, a court may exercise jurisdiction only as authorized by the state's long-arm statute and as permitted by the Due Process Clause.

Due process permits jurisdiction over a nonresident only where the defendant has minimum contacts with the forum such that suit does not offend traditional notions of fair play and substantial justice. The contacts must arise from the defendant's purposeful availment of the forum, making it foreseeable that the defendant could be haled into court there.

Specific jurisdiction exists when the claim arises out of or relates to the defendant's contacts with the forum. General (all-purpose) jurisdiction permits suit on any claim, but only where the defendant is essentially at home, which for individuals is their domicile and for corporations is ordinarily the state of incorporation and principal place of business.

Merely placing a product into the stream of commerce with awareness it may reach the forum is, under the plurality view, insufficient for jurisdiction; the defendant must take additional conduct purposefully directed at the forum. Courts also weigh reasonableness factors including the forum's interest, the plaintiff's interest in convenient relief, and the burden on the defendant.

Due process requires that notice be reasonably calculated, under all the circumstances, to apprise interested parties of the action and afford them an opportunity to object. Where a party's address is known, notice by publication alone is constitutionally inadequate.

Under Rule 4, an individual may be served by personal delivery, by leaving the papers at the defendant's usual abode with a resident of suitable age and discretion, by delivery to an authorized agent, or by any method allowed under the law of the forum or service state. Process must generally be served within 90 days of filing, and a defendant may be requested to waive formal service.

Under 28 U.S.C. §1391, venue is proper in a judicial district where any defendant resides (if all defendants reside in the same state), or where a substantial part of the events or omissions giving rise to the claim occurred. A corporate defendant resides in any district where it is subject to personal jurisdiction.

Under §1404(a), a court may transfer a case from a proper venue to another district where it could have been brought, for the convenience of parties and witnesses and in the interest of justice; the transferee court applies the same state law the original court would have applied. Under §1406, a court may transfer or dismiss when venue is improper.

A court may dismiss under forum non conveniens when the far more appropriate forum is in a different judicial system (such as a foreign country) where transfer is unavailable. The court weighs private interests of the litigants and public interests, and the plaintiff's choice of forum is given less deference when the plaintiff is foreign.

Under the Erie doctrine, a federal court sitting in diversity applies state substantive law and federal procedural law. Where no federal directive is on point, the court asks whether ignoring the state rule would lead to forum shopping or inequitable administration of the laws, treating outcome-determinative rules like statutes of limitations as substantive.

Under Hanna v. Plumer, when a valid Federal Rule of Civil Procedure is directly on point and conflicts with state law, the federal court applies the federal rule so long as it is procedural and within the scope of the Rules Enabling Act. The outcome-determinative and forum-shopping analysis applies only in the absence of a controlling federal directive.

Under Klaxon, a federal court sitting in diversity must apply the choice-of-law rules of the state in which it sits. This ensures that the substantive outcome does not differ merely because the case is heard in federal rather than state court.

Under Rule 8(a), a complaint must contain a short and plain statement showing entitlement to relief. Under the Twombly and Iqbal standard, the complaint must state a claim that is plausible on its face; the court disregards conclusory allegations and asks whether the well-pleaded facts permit a reasonable inference of liability.

Under Rule 9(b), allegations of fraud or mistake must be pleaded with particularity, including the who, what, when, where, and how. Conditions of a person's mind, such as malice, intent, or knowledge, may be alleged generally.

By signing a pleading or motion, an attorney certifies under Rule 11 that, to the best of their knowledge after a reasonable inquiry, it is not presented for an improper purpose, the legal contentions are warranted, and the factual contentions have evidentiary support. A motion for sanctions must comply with the 21-day safe harbor, giving the offending party time to withdraw the filing.

A defendant must serve an answer within 21 days of service (or 14 days after a Rule 12 motion is denied), admitting, denying, or pleading insufficient knowledge as to each allegation; an allegation not denied is deemed admitted. Affirmative defenses, such as statute of limitations, res judicata, and contributory negligence, must be raised in the answer or are generally waived.

A party may amend a pleading once as a matter of course within 21 days; thereafter amendment requires leave of court, which is freely given when justice requires. Under Rule 15(c), an amendment changing a claim relates back if it arises from the same conduct, transaction, or occurrence; an amendment changing the defendant relates back only if, within the Rule 4(m) period, the new party received notice and knew it would have been named but for a mistake in identity.

A compulsory counterclaim arises from the same transaction or occurrence as the opposing party's claim and must be asserted in the pending action or it is forfeited. A permissive counterclaim is unrelated and may be asserted but is not required, though it needs an independent jurisdictional basis.

A cross-claim under Rule 13(g) is a claim against a co-party arising from the same transaction or occurrence and is always permissive. Under Rule 14 impleader, a defending party may bring in a third-party defendant who is or may be liable to it for all or part of the plaintiff's claim, typically on a theory of indemnity or contribution.

Under Rule 20, plaintiffs or defendants may be joined when claims arise from the same transaction or occurrence and share a common question of law or fact. Under Rule 19, a required (necessary) party must be joined if feasible where complete relief is impossible without them or their interest would be impaired; if joinder is not feasible and the party is indispensable, the action must be dismissed.

Under Rule 24, a nonparty may intervene of right when it has an impairable interest not adequately represented, or permissively when its claim shares a common question with the main action. Interpleader allows a stakeholder facing multiple claims to a single fund to join all claimants and force them to litigate among themselves.

A Rule 23 class action requires numerosity, commonality, typicality, and adequacy of representation, plus one of the three types under 23(b), with the common (b)(3) damages class also requiring predominance and superiority and notice with opt-out rights. Under CAFA, federal courts have jurisdiction where the class exceeds 100 members, the aggregate amount exceeds $5 million, and there is minimal diversity between any class member and any defendant.

Under Rule 26(b)(1), parties may discover any nonprivileged matter relevant to a claim or defense and proportional to the needs of the case. Information need not be admissible to be discoverable, and the court weighs factors such as the importance of the issues and whether the burden outweighs the likely benefit.

The work product doctrine protects materials prepared in anticipation of litigation from discovery, though ordinary work product may be obtained on a showing of substantial need and inability to obtain the equivalent without undue hardship. Opinion work product, reflecting an attorney's mental impressions and legal theories, receives near-absolute protection.

A retained testifying expert must provide a written report, and the opposing party may depose them; consulting experts not expected to testify are generally shielded absent exceptional circumstances. Communications between attorney and testifying expert and draft reports are protected as work product, while the attorney-client privilege separately protects confidential legal communications.

Under Rule 37, a party may move to compel discovery and, after a violation of a court order, seek sanctions ranging from cost-shifting to establishing facts, striking pleadings, or dismissal or default. Rule 37(e) governs sanctions for failure to preserve electronically stored information, allowing the harshest sanctions only on a finding of intent to deprive.

Under Rule 12(b), certain defenses may be raised by pre-answer motion. The defenses of lack of personal jurisdiction, improper venue, insufficient process, and insufficient service are waived if not raised in the first Rule 12 response. Subject-matter jurisdiction may be raised at any time, even on appeal, and failure to state a claim may be raised through trial.

When a defendant fails to respond, the clerk may enter a default, and a default judgment may follow, limited to the relief demanded in the complaint. A plaintiff may voluntarily dismiss once without prejudice before the answer or summary judgment; an involuntary dismissal for failure to prosecute or comply ordinarily operates as an adjudication on the merits.

Under Rule 56, a court grants summary judgment when there is no genuine dispute of material fact and the movant is entitled to judgment as a matter of law. The court views the evidence in the light most favorable to the nonmoving party; the movant may prevail by showing the nonmovant lacks evidence to support an essential element on which it bears the burden.

The Seventh Amendment preserves the right to a jury trial in civil actions at law but not in suits in equity. Where legal and equitable claims are joined, the legal issues are tried first to a jury, and the jury's factual findings bind the court on common issues.

Under Rule 50(a), a court may grant judgment as a matter of law after a party has been fully heard if no reasonable jury could find for that party. A renewed motion under Rule 50(b) may be made within 28 days after judgment, but only if a Rule 50(a) motion was made before the case went to the jury.

Under Rule 59, a court may grant a new trial within 28 days of judgment for errors such as a verdict against the great weight of the evidence, excessive or inadequate damages, jury misconduct, or prejudicial legal error. The court may condition denial of a new trial on the plaintiff's acceptance of a remittitur reducing an excessive award.

Under 28 U.S.C. §1291, courts of appeals generally have jurisdiction only over final judgments that dispose of all claims as to all parties. A notice of appeal must ordinarily be filed within 30 days of entry of judgment (60 days when the United States is a party).

Exceptions to finality include injunction orders under §1292(a), discretionary certified questions under §1292(b), Rule 54(b) certification of fewer than all claims, and class certification review under Rule 23(f). The collateral order doctrine permits immediate appeal of an order that conclusively determines an important issue separate from the merits and effectively unreviewable on final appeal.

Claim preclusion (res judicata) bars relitigation of a claim where there was a final judgment on the merits, the same claim arising from the same transaction, and the same parties or their privies. It forecloses not only matters actually litigated but all grounds for recovery that could have been raised in the first action.

Issue preclusion (collateral estoppel) bars relitigation of an issue of fact or law that was actually litigated, determined by a valid final judgment, and essential to that judgment. The party against whom preclusion is asserted must have had a full and fair opportunity to litigate; many courts now permit nonmutual issue preclusion, abandoning the strict mutuality requirement.

Under Marbury v. Madison, the federal judiciary has the power of judicial review to declare acts of Congress and the executive unconstitutional. The Supreme Court's original jurisdiction is fixed by the Constitution and cannot be enlarged by Congress, while its appellate jurisdiction is subject to congressional exceptions and regulations.

To have standing, a plaintiff must show an injury in fact that is concrete and particularized, causation traceable to the defendant's conduct, and redressability by a favorable decision. Generalized grievances shared by all citizens are insufficient.

A taxpayer generally lacks standing to challenge government expenditures, subject to the narrow Flast exception for Establishment Clause challenges to congressional spending. A litigant may assert the rights of a third party when it suffers its own injury, has a close relationship with the third party, and the third party faces obstacles to asserting their own rights.

A claim is not ripe if it depends on contingent future events that may not occur, weighing the fitness of the issues and hardship to the parties of withholding review. A case becomes moot when the controversy ends, except where the harm is capable of repetition yet evading review, the defendant voluntarily ceases the conduct, or in a properly certified class action.

Courts will not decide political questions, meaning issues committed by the Constitution to another branch or lacking judicially manageable standards. Classic examples include challenges to the conduct of foreign affairs, the impeachment process, and partisan gerrymandering.

The Eleventh Amendment and principles of sovereign immunity bar most suits for damages against a state in federal court by private parties. Exceptions include suits seeking prospective injunctive relief against state officers under Ex parte Young, valid abrogation by Congress under §5 of the Fourteenth Amendment, and a state's waiver of immunity.

Under the Commerce Clause, Congress may regulate the channels and instrumentalities of interstate commerce, and activities that substantially affect interstate commerce. For economic activity, courts aggregate effects, but Congress may not compel individuals to engage in commerce nor regulate noneconomic activity merely because it has attenuated effects.

Congress may tax and spend for the general welfare, and may impose conditions on federal grants to the states so long as the conditions are clearly stated, relate to the federal interest, and are not unconstitutionally coercive. A tax is generally valid if it raises revenue, even if it also has a regulatory effect.

The Necessary and Proper Clause empowers Congress to enact laws that are rationally related to the execution of an enumerated power. It is not an independent source of power but augments Congress's other granted authorities.

Under §5 of the Fourteenth Amendment, Congress may enact laws to enforce equal protection and due process, but only to remedy or deter violations as defined by the courts. Such legislation must show congruence and proportionality between the injury and the remedy and may not create new substantive rights.

Congress also holds enumerated powers including the war and military powers, the powers over naturalization, bankruptcy, and the postal system, the power to regulate federal property and territories, and the powers to coin money and grant patents and copyrights. There is no general federal police power, except over the District of Columbia, federal lands, and military matters.

Congress may delegate rulemaking authority to agencies so long as it provides an intelligible principle to guide the exercise of discretion. However, Congress may not retain a legislative veto over executive action, and all lawmaking must satisfy bicameralism and presentment.

The President appoints principal officers with Senate confirmation, while Congress may vest appointment of inferior officers in the President, courts, or department heads. The President may generally remove executive officers at will, but Congress may impose good-cause limits on removal of officials performing quasi-judicial or quasi-legislative functions, subject to limits where removal restrictions impede the President's core executive functions.

Executive privilege protects the confidentiality of presidential communications, but it is qualified and yields to a demonstrated need in a criminal proceeding. The President enjoys absolute immunity from civil damages for official acts within the outer perimeter of the office, but no immunity for purely private conduct.

Under the Youngstown framework, presidential power is greatest when acting with congressional authorization, uncertain in the zone of twilight where Congress is silent, and weakest when acting against the will of Congress. In foreign affairs, the President is the primary voice, may enter executive agreements, and treaties become supreme federal law.

Under the Supremacy Clause, valid federal law preempts conflicting state law. Express preemption occurs by statutory language; implied preemption arises where compliance with both is impossible (conflict preemption), state law obstructs federal objectives, or Congress has occupied the entire field.

The Tenth Amendment reserves to the states powers not delegated to the federal government. Under the anti-commandeering principle, Congress may not compel states to enact or enforce a federal regulatory program nor direct state officials to administer federal law, though it may regulate states through generally applicable laws and attach conditions to spending.

The Dormant Commerce Clause bars states from unduly burdening interstate commerce. A law that discriminates against out-of-state commerce is virtually per se invalid unless it serves a legitimate local purpose that cannot be achieved by nondiscriminatory means; a nondiscriminatory law is upheld unless the burden on commerce clearly exceeds the local benefits (Pike balancing).

Under the market participant exception, a state acting as a buyer or seller may favor its own citizens free of Dormant Commerce Clause limits. The Article IV Privileges and Immunities Clause bars discrimination against out-of-state citizens regarding fundamental rights such as employment, absent a substantial justification; it does not protect corporations or aliens.

Most constitutional guarantees restrain only the government, so private conduct generally does not violate them. Private action may be treated as state action where the private party performs a traditional and exclusive public function, or where the government is significantly entangled with or coerces the private conduct.

Procedural due process attaches only when the government deprives a person of a protected liberty or property interest. A property interest requires a legitimate entitlement created by an independent source such as a statute or contract, not a mere unilateral expectation. A liberty interest includes freedom from physical restraint and certain fundamental freedoms.

Procedural due process requires fair process before the government deprives a person of life, liberty, or property. The process due is determined by the Mathews v. Eldridge balancing of the private interest affected, the risk of erroneous deprivation and value of additional safeguards, and the government's interest including administrative burden.

Substantive due process protects certain fundamental rights, including marriage, procreation, contraception, child rearing, and travel, against government infringement under strict scrutiny. Laws burdening non-fundamental interests are reviewed only for a rational basis.

Economic and social welfare legislation receives only rational basis review and is upheld if rationally related to a legitimate interest, ending the era of heightened economic due process. The Second Amendment protects an individual right to keep and bear arms, and a modern firearm regulation is valid only if it is consistent with the Nation's historical tradition of firearm regulation.

Under equal protection, most classifications receive rational basis review and are upheld if rationally related to a legitimate interest. Strict scrutiny (narrowly tailored to a compelling interest) applies to suspect classes and fundamental rights, while intermediate scrutiny (substantially related to an important interest) applies to quasi-suspect classes.

Suspect classifications triggering strict scrutiny include race, national origin, and alienage (with exceptions for federal classifications and political-function jobs). Quasi-suspect classifications triggering intermediate scrutiny include gender and nonmarital parentage; gender classifications require an exceedingly persuasive justification. Facially neutral laws trigger heightened review only if there is both discriminatory intent and effect.

The Takings Clause requires just compensation when the government takes private property for public use. A permanent physical occupation and a regulation denying all economically viable use are per se takings; otherwise, courts apply the Penn Central factors weighing economic impact, interference with investment-backed expectations, and the character of the government action.

The Contracts Clause bars states from substantially impairing existing contractual obligations. Impairment of private contracts is permitted if it is reasonable and necessary to serve an important public purpose; impairment of the state's own contracts receives stricter review. The clause does not apply to the federal government.

Content-based restrictions on speech, which target the subject matter or viewpoint, are presumptively invalid and subject to strict scrutiny. Content-neutral regulations of the time, place, and manner of speech are reviewed under intermediate scrutiny, requiring that they be narrowly tailored to a significant interest and leave open ample alternative channels.

A prior restraint stops speech before it occurs and bears a heavy presumption of unconstitutionality. Any licensing scheme must contain narrow, definite standards limiting official discretion and procedural safeguards, including prompt judicial review.

A speech regulation is void for vagueness if it fails to give a person of ordinary intelligence fair notice of what is prohibited or invites arbitrary enforcement. A law is overbroad if it restricts substantially more protected speech than necessary, and may be challenged facially even by one whose own speech could be regulated.

Certain categories of speech receive little or no protection, including incitement to imminent lawless action likely to occur (Brandenburg), fighting words, true threats, obscenity under the Miller test, and defamation. Regulations within unprotected categories may still not discriminate based on viewpoint.

In traditional and designated public forums, the government may impose only content-neutral time, place, and manner restrictions, with content-based limits subject to strict scrutiny. In a limited or nonpublic forum, the government may restrict speech so long as the regulation is reasonable and viewpoint-neutral.

Commercial speech that is truthful and concerns lawful activity may be regulated only if the government asserts a substantial interest, the regulation directly advances it, and it is not more extensive than necessary (Central Hudson). Symbolic speech may be regulated under the O'Brien test where the regulation furthers an important interest unrelated to suppressing expression and burdens no more speech than necessary.

The First Amendment protects the freedom of association, and laws that burden a group's expressive association are subject to strict scrutiny. The government generally may not punish membership in a group unless the person has specific intent to further the group's unlawful ends, and an expressive association may exclude members whose presence would impair its message.

The Establishment Clause bars the government from establishing or endorsing religion. The Supreme Court now evaluates such claims with reference to historical practices and understandings, asking whether a challenged practice is consistent with the Nation's traditions, while continuing to forbid government coercion of religious exercise and overt religious favoritism.

The Free Exercise Clause protects religious belief absolutely, but a neutral law of general applicability that incidentally burdens religious conduct is valid under rational basis review (Employment Division v. Smith). A law that targets religious practice or is not generally applicable triggers strict scrutiny.

UCC Article 2 governs contracts for the sale of goods (movable, tangible things), while the common law governs contracts for services, real estate, and intangibles. Where a single contract mixes goods and services, courts apply the predominant-purpose test, applying one body of law to the entire contract based on whichever element dominates. A few jurisdictions instead apply the gravamen test, looking to whether the alleged breach concerns the goods or the services portion.

A merchant under the UCC is one who deals in goods of the kind, or otherwise holds himself out as having special knowledge or skill peculiar to the goods or practices involved. Several Article 2 rules apply only to merchants or impose heightened obligations on them, including the firm offer rule, the 2-207 additional-terms rule, the implied warranty of merchantability, and the merchant confirmatory memo exception to the Statute of Frauds.

An offer is a manifestation of present willingness to enter a bargain, made so as to justify another person in understanding that assent will conclude the deal. It must convey a present intent to contract (objective standard), be reasonably certain in its essential terms, and be communicated to the offeree. Under the UCC, a contract for the sale of goods may be enforceable even though one or more terms are left open, so long as the parties intended to contract and a reasonably certain basis for a remedy exists; quantity, however, generally must be stated.

Advertisements are generally treated as invitations to deal rather than offers, because they typically lack a commitment to a specific offeree and contain indefinite terms. An advertisement becomes an offer only when it is clear, definite, and explicit, leaving nothing open for negotiation, such as a reward offer or an ad promising sale to the first comer on stated terms.

An offer terminates by lapse when its stated time expires or, absent a time, after a reasonable time. The offeror may revoke any time before acceptance, effective when received; revocation may be indirect if the offeree learns from a reliable source of conduct inconsistent with intent to contract. An offer also ends upon rejection or counteroffer by the offeree, or upon the death or incapacity of either party.

An option contract is a separate promise to hold an offer open that is itself supported by consideration, making the offer irrevocable for the option period. Once an option exists, a rejection or counteroffer does not terminate the offer, and acceptance is effective only upon receipt (the mailbox rule does not apply to options).

Under UCC 2-205, a firm offer by a merchant to buy or sell goods, made in a signed writing that gives assurance it will be held open, is irrevocable for the stated time, or a reasonable time if none is stated, but in no event longer than three months, even without consideration. If the assurance term is on a form supplied by the offeree, it must be separately signed by the offeror.

An offer for a unilateral contract becomes irrevocable once the offeree begins performance, which creates an option giving the offeree a reasonable time to complete; mere preparation to perform is not enough but may support reliance recovery. Separately, an offer may be made temporarily irrevocable where the offeree reasonably and foreseeably relies on it to his detriment before acceptance.

An acceptance is a manifestation of assent to the offer's terms, made by the offeree in the manner invited. At common law, the mirror image rule requires that acceptance match the offer exactly; any variation operates as a rejection and counteroffer. The offeror is the master of the offer and may dictate the required method of acceptance.

Under UCC 2-207, a definite expression of acceptance forms a contract even if it states additional or different terms, unless acceptance is expressly conditioned on assent to the new terms. Between merchants, additional terms become part of the contract unless the offer limits acceptance to its terms, the new terms materially alter the deal, or the offeror objects within a reasonable time. If a non-merchant is involved, additional terms are mere proposals; where conduct recognizes a contract but writings disagree, the terms are those on which the writings agree plus UCC gap-fillers.

Under the mailbox rule, an acceptance is effective upon dispatch if sent by a reasonable means, so a contract forms even if the acceptance is lost in transit. The rule does not apply to option contracts, to acceptances after a rejection was sent first (then whichever arrives first controls), or where the offer provides otherwise. Revocations and rejections are effective only on receipt.

Under UCC 2-206, an order to buy goods for prompt shipment may be accepted either by a promise to ship or by prompt shipment of conforming or nonconforming goods. Shipment of nonconforming goods is both an acceptance and a breach, unless the seller seasonably notifies the buyer that the shipment is offered only as an accommodation, in which case it is a counteroffer.

Consideration requires a bargained-for exchange of legal value, meaning each party incurs a legal detriment or the promise induces and is induced by the return promise or performance. Courts do not weigh the adequacy of consideration, but gift promises, past consideration, and illusory promises generally fail. A promise conditioned on an event within the promisor's unlimited control is illusory and unenforceable.

Under the pre-existing duty rule, a promise to do something one is already legally bound to do is not consideration, so a promise to pay more for the same performance is unenforceable at common law. Exceptions arise where there is new or different performance, an honest dispute about the duty, or unforeseen difficulties making performance substantially more burdensome.

At common law, a contract modification requires new consideration unless an unforeseen difficulty justifies it. Under the UCC 2-209, a modification of a goods contract needs no consideration, requiring only good faith. A signed agreement barring oral modification (a no-oral-modification clause) is enforceable under the UCC, and modifications may need to satisfy the Statute of Frauds if the contract as modified is within it.

Promissory estoppel serves as a substitute for consideration where a promisor makes a promise that he should reasonably expect to induce action or forbearance, the promisee actually and reasonably relies to his detriment, and injustice can be avoided only by enforcement. Recovery may be limited to reliance damages as justice requires rather than the full expectation interest.

A minor (under 18) may generally disaffirm a contract before or shortly after reaching majority, but is liable in quasi-contract for the reasonable value of necessaries. A minor who fails to disaffirm within a reasonable time after majority, or who keeps the benefit, ratifies the contract. Contracts of those who are mentally incompetent or intoxicated are voidable where the party could not understand the nature and consequences of the transaction.

A mutual mistake as to a basic assumption that materially affects the exchange makes the contract voidable by the adversely affected party, unless that party bore the risk of the mistake. A unilateral mistake ordinarily does not permit avoidance unless enforcement would be unconscionable or the other party knew or had reason to know of the mistake. Mistakes in judgment about value are not grounds for relief.

A contract is voidable by a party who justifiably relies on a material or fraudulent misrepresentation of fact. Fraud in the inducement renders the contract voidable, while fraud in the factum (deception about the nature of the document signed) renders it void. Generally there is no duty to disclose, but a duty arises to correct half-truths, to disclose where a fiduciary relationship exists, or to correct a prior statement that has become false.

Duress by an improper threat that leaves the victim no reasonable alternative makes a contract voidable; economic duress qualifies where one party wrongfully threatens to breach unless the other agrees to new terms and the victim has no adequate alternative source. Undue influence is unfair persuasion of a party who is under the domination of, or reposes special trust in, the persuader, overcoming the victim's free will.

A court may refuse to enforce a contract or clause that is unconscionable, judged as of the time of formation. Analysis examines procedural unconscionability (unfair bargaining, hidden terms, absence of meaningful choice) and substantive unconscionability (oppressive or grossly one-sided terms). The court may refuse enforcement entirely, strike the offending clause, or limit its application.

A contract with an illegal subject matter or formed for an illegal purpose is generally void and unenforceable. If only the consideration or purpose is illegal, or one party is innocent, courts may grant relief, and a party not in pari delicto may sometimes recover. Where illegality is merely a failure to obtain a regulatory license for revenue-raising rather than protective purposes, enforcement may still be allowed.

The Statute of Frauds requires a signed writing for contracts within the MY LEGS categories: Marriage, those not performable within one Year, Land interests, contracts by an executor to pay estate debts personally, Goods of $500 or more, and suretyship (promises to answer for another's debt). The writing must reasonably identify the subject matter, indicate a contract, state essential terms, and be signed by the party to be charged.

Performance can satisfy the Statute: under the UCC, part performance validates a goods contract to the extent of goods accepted or paid for, and specially manufactured goods not suitable for resale are enforceable once the seller substantially begins. For land, a buyer's part performance (typically two of payment, possession, and improvements) permits enforcement. The merchant confirmatory memo binds a merchant who fails to object within 10 days, judicial admission binds to the admitted quantity, and full performance removes the one-year bar.

The parol evidence rule bars admission of prior or contemporaneous agreements that contradict a writing the parties intended as a final expression of their agreement. A fully integrated writing also excludes consistent additional terms, while a partially integrated writing may be supplemented by consistent additional terms. The rule does not bar evidence offered to show a defense to formation (fraud, duress, mistake), a condition precedent to effectiveness, a collateral agreement, or to interpret ambiguous terms; subsequent modifications are never barred.

An express warranty arises from any affirmation of fact, promise, description, or sample that becomes part of the basis of the bargain; mere puffery or opinion does not qualify. The implied warranty of merchantability, given only by a merchant dealing in goods of the kind, warrants that goods are fit for their ordinary purpose. The implied warranty of fitness for a particular purpose arises when any seller has reason to know of the buyer's particular purpose and that the buyer is relying on the seller's skill to select suitable goods.

The implied warranty of merchantability may be disclaimed by mentioning merchantability (orally or in writing, but conspicuously if written), and fitness may be disclaimed only by a conspicuous writing. Expressions like as is or with all faults disclaim implied warranties, as does the buyer's examination of the goods (or refusal to examine) as to defects an exam would reveal. An express warranty and a disclaimer are read consistently where possible, but a disclaimer cannot negate an express warranty.

Where parties leave terms open, the UCC supplies gap-fillers: a reasonable price at delivery if price is open, reasonable time for performance, delivery in a single lot at the seller's place of business, and payment due on delivery. Quantity is generally not gap-filled, though output and requirements contracts measure quantity by actual good-faith output or requirements, not unreasonably disproportionate to any stated estimate.

A condition is an event that must occur before a performance becomes due (condition precedent) or that discharges a duty (condition subsequent). Express conditions must be strictly satisfied, while constructive conditions implied by law require only substantial compliance. A condition may be excused by waiver, estoppel, hindrance or wrongful prevention by the party benefited, or to avoid forfeiture.

Under the common law, a party who renders substantial performance of a constructive condition may recover on the contract, less damages for the deficiency, even though performance is not perfect. A party who materially breaches cannot enforce the contract but may recover in restitution for benefits conferred beyond the other party's damages. The doctrine does not apply where the contract makes performance an express condition.

Under the perfect tender rule, if goods or their tender fail in any respect to conform to the contract, the buyer may reject the whole, accept the whole, or accept any commercial units and reject the rest. The seller has a right to cure within the original contract time, and even beyond it if the seller reasonably believed the nonconforming tender would be acceptable, by seasonably notifying the buyer and making a conforming tender within a further reasonable time.

In an installment contract, the buyer may reject a particular installment only if its nonconformity substantially impairs the value of that installment and cannot be cured. The whole contract is breached only when a nonconformity or default substantially impairs the value of the entire contract; the perfect tender rule does not govern installment deliveries.

A material breach deprives the non-breaching party of the substantial benefit of the bargain, excusing that party's remaining performance and permitting suit for total breach. A minor breach does not excuse counter-performance; the aggrieved party must perform but may recover damages for the defect. Factors include the extent of benefit received, adequacy of damages, the breaching party's good faith, and the likelihood of cure.

An anticipatory repudiation is an unequivocal statement or voluntary act, before performance is due, indicating that a party will not perform. The non-repudiating party may immediately sue for breach, suspend its own performance, or await performance for a commercially reasonable time. A repudiation may be retracted until the other party cancels, materially changes position in reliance, or indicates the repudiation is final.

When reasonable grounds for insecurity arise about a party's performance, the other party may in writing demand adequate assurance and, if commercially reasonable, suspend its own performance pending assurance. Failure to provide adequate assurance within a reasonable time (not exceeding 30 days under the UCC) is treated as a repudiation of the contract.

Performance is excused by impossibility where, after formation, performance becomes objectively impossible due to a supervening event whose non-occurrence was a basic assumption, such as death of a person essential to performance, destruction of the contract's subject matter, or supervening illegality. Impracticability excuses where performance becomes extremely and unreasonably difficult or expensive due to an unanticipated event, but mere increased cost is generally insufficient.

Frustration of purpose excuses performance when a supervening event substantially frustrates a party's principal purpose, the non-occurrence of that event was a basic assumption, and the frustration was not the fault of the party seeking discharge. Performance remains possible, but the value of the exchange has been destroyed; the purpose must have been known to both parties at formation.

Expectation damages aim to place the non-breaching party in the position it would have occupied had the contract been fully performed, measured by the loss in value plus incidental and consequential losses, minus costs avoided. Recovery is limited by foreseeability (consequential damages must have been reasonably foreseeable at formation, per Hadley v. Baxendale), certainty (damages cannot be speculative), and mitigation (no recovery for losses the plaintiff could reasonably have avoided).

Reliance damages reimburse expenditures made in reasonable reliance on the contract, restoring the plaintiff to its pre-contract position, and are available where expectation damages are too uncertain. Restitution prevents unjust enrichment by awarding the reasonable value of benefits conferred on the other party, and is available even to a breaching party for the net benefit conferred, and in quasi-contract where no enforceable contract exists.

A liquidated damages clause is enforceable if, at the time of contracting, actual damages were difficult to estimate and the stipulated amount is a reasonable forecast of probable harm. A clause that operates as a penalty to coerce performance, rather than to compensate, is unenforceable. Some authorities also assess reasonableness in light of the actual harm that occurs.

On the seller's breach, a buyer may cover by purchasing substitute goods in good faith and recover the cover price minus contract price, plus incidental and consequential damages; alternatively, the buyer may recover the market price minus contract price. A buyer who has accepted nonconforming goods may recover the difference between the value as warranted and as accepted. Specific performance or replevin is available where goods are unique or in other proper circumstances.

On the buyer's breach, a seller may resell the goods in good faith and recover contract price minus resale price plus incidentals, or recover contract price minus market price. A lost-volume seller may instead recover lost profit where resale does not make it whole. The seller may recover the full price for goods the buyer has accepted, or for conforming goods the seller cannot reasonably resell.

Specific performance is an equitable remedy available when the legal remedy is inadequate, typically for contracts involving land (deemed unique) or unique goods such as art or rare items. It is not available for personal service contracts, though a court may issue a negative injunction enforcing a non-compete. Equitable defenses such as laches and unclean hands may bar relief.

A third-party beneficiary may enforce a contract only if intended, meaning the parties intended to benefit the third party and that benefit was a purpose of the contract; incidental beneficiaries have no rights. The beneficiary's rights vest when she learns of and assents to the promise, sues to enforce it, or detrimentally relies, after which the original parties cannot modify or rescind without her consent. The beneficiary sues the promisor, who may raise defenses arising from the contract.

An assignment transfers the assignor's contractual rights to an assignee, who may then enforce them against the obligor. Most rights are assignable, but assignment is barred where it would materially change the obligor's duty or risk, or where validly prohibited; a clause barring assignment of rights is often construed only as a promise (breach but valid assignment), unlike a clause barring the power to assign. Between successive assignees, the majority follows the first-in-time rule, subject to exceptions.

A delegation transfers the duty of performance to a delegate, but the delegating party remains liable on the contract unless there is a novation. Duties are delegable unless the obligee has a substantial interest in personal performance (e.g., contracts for unique skills or special trust) or delegation is barred by contract. If the delegate assumes the duty for consideration, the obligee may enforce it as an intended third-party beneficiary.

An accord is an agreement to accept a different performance in satisfaction of an existing duty, and satisfaction is the performance of that accord, which discharges the original duty. Until satisfaction occurs, the original duty is merely suspended, and on breach of the accord the creditor may sue on either the original obligation or the accord. Acceptance of a good-faith check tendered as payment in full on a disputed claim discharges the debt.

A novation is a new contract substituting a new party for an original party, which immediately discharges the replaced party's duties; it requires a valid prior contract, agreement of all parties, and an existing duty. A mutual rescission discharges both parties' duties by agreement, supported by consideration in the form of each party's surrender of rights, and is generally available so long as the contract remains at least partly executory on both sides.

Criminal liability requires an actus reus, a voluntary physical act or a qualifying omission. Involuntary bodily movements (reflexes, convulsions, acts during unconsciousness or sleep) do not satisfy this requirement. An omission is criminal only where a legal duty to act exists, arising from statute, contract, special relationship, voluntary assumption of care, or creation of the peril, and the defendant had the physical ability to act.

A specific intent crime requires proof that the defendant intended a particular further result beyond the act itself (e.g., burglary, larceny, robbery, forgery, false pretenses, attempt, conspiracy, solicitation), and uniquely permits defenses of voluntary intoxication and unreasonable mistake of fact. A general intent crime requires only an intent to do the prohibited act (e.g., battery, rape, kidnapping, false imprisonment). Malice crimes (common-law murder and arson) require a reckless disregard of an obvious risk.

The Model Penal Code recognizes four culpability levels: purposely (conscious object to cause the result), knowingly (practical certainty the result will occur), recklessly (conscious disregard of a substantial and unjustifiable risk), and negligently (failure to perceive such a risk, a gross deviation from the reasonable-person standard). When a statute is silent, recklessness is the default minimum, and a stated mental state presumptively applies to all material elements.

Strict liability crimes require no mens rea as to at least one material element and typically involve public welfare regulations or statutory rape; no mistake-of-fact defense applies. Under transferred intent, when a defendant intends harm to one victim but harms another, the intent transfers to the actual victim, and the defendant may also be liable for attempt against the intended victim. Transferred intent generally does not apply to attempt itself.

The principle of concurrence requires that the defendant possess the requisite mens rea at the time he engages in the actus reus, and that the mental state actually set in motion the criminal act. An intent that arises only after the conduct (such as forming intent to steal after lawfully entering) generally cannot supply the concurrence needed for crimes like burglary or larceny.

The prosecution must prove both actual cause (cause-in-fact), satisfied if the result would not have occurred but for the defendant's conduct, and proximate cause (legal cause), satisfied if the result is a natural and probable consequence that was foreseeable. An intervening cause breaks the chain only if it is a superseding, unforeseeable event; a defendant takes the victim as he finds him under the eggshell principle, and ordinary medical negligence does not break causation.

Common-law murder is the unlawful killing of another with malice aforethought, which exists in four forms: intent to kill, intent to inflict serious bodily harm, a depraved heart (reckless indifference to an unjustifiably high risk to human life), and felony murder. Malice may be inferred from the intentional use of a deadly weapon.

Many statutes divide murder into degrees: first-degree murder typically requires a premeditated and deliberate intentional killing, certain killings by specified means (poison, lying in wait), or enumerated felony murder. Second-degree murder is the catch-all for other malice killings, including depraved-heart and intent-to-cause-serious-harm killings. Premeditation requires reflection, though it may form in a very short time.

Felony murder is a killing, even accidental, committed during the commission or attempted commission of an inherently dangerous felony (commonly BARRK: burglary, arson, robbery, rape, kidnapping). Limitations include that the underlying felony be independent of the killing (merger bars assault-based felony murder), that the death be a foreseeable result, and that it occur during the felony or immediate flight before reaching a point of temporary safety. Under the majority agency theory, the felon is not liable for killings committed by police or resisting victims; the minority proximate-cause theory may impose liability.

Voluntary manslaughter is an intentional killing committed in the heat of passion arising from adequate provocation that would cause a reasonable person to lose self-control, where the defendant actually was provoked and there was no reasonable cooling-off period. It also includes killings under an imperfect self-defense, where the defendant honestly but unreasonably believed deadly force was necessary. Words alone are generally not adequate provocation.

Involuntary manslaughter is an unintentional killing resulting from criminal negligence (a gross deviation from the reasonable standard of care, more than civil negligence) or recklessness, or one occurring during the commission of an unlawful act not amounting to felony murder under the misdemeanor-manslaughter rule. The MPC requires recklessness and treats negligent killings as a separate offense of negligent homicide.

Larceny is the trespassory taking and carrying away (asportation) of the personal property of another with the intent to permanently deprive at the time of the taking. The taking must be without consent; continuing trespass applies where the defendant wrongfully takes property intending to return it but later decides to keep it. Borrowing with intent to return is not larceny unless the property is essentially consumed or recklessly exposed to loss.

Embezzlement is the fraudulent conversion of property of another by one already in lawful possession of it, distinguished from larceny because possession was rightfully obtained. False pretenses is obtaining title to property by an intentional false statement of material fact intended to and that does defraud the victim, differing from larceny by trick, where only possession (not title) passes.

Robbery is larceny from the person or presence of the victim by force or intimidation (threat of imminent harm), combining theft with an assault. Extortion (blackmail) is obtaining property through threats of future harm, such as exposing a secret, and at common law did not require that property be taken from the victim's presence. The threatened harm in robbery must be imminent; future threats fall under extortion.

Common-law burglary is the breaking and entering of the dwelling of another at nighttime with the intent to commit a felony therein. The breaking may be actual or constructive (by fraud or threat), and the felonious intent must exist at the time of entry. Modern statutes typically eliminate the dwelling, nighttime, and breaking requirements and extend the crime to any structure.

Common-law arson is the malicious burning of the dwelling of another. The burning requires some charring of the structure; mere scorching or smoke damage is insufficient, and burning by explosion alone historically did not qualify. Modern statutes commonly extend arson to any structure, including the defendant's own, and to burning by explosion.

Kidnapping is the unlawful confinement of a person involving either movement (asportation) or concealment in a secret place. Receiving stolen property requires receiving control of stolen property, with knowledge that it is stolen, and the intent to permanently deprive the owner; under the majority rule, the property must actually retain its stolen character at the time of receipt.

Solicitation is enticing, encouraging, or commanding another to commit a crime, with the intent that the person commit it. The offense is complete at the moment of the asking, regardless of whether the other person agrees or acts. Solicitation merges into the completed crime or into conspiracy if the target agrees, and at common law factual impossibility is no defense.

Conspiracy is an agreement between two or more persons to commit an unlawful act, with the intent to agree and the intent to achieve the unlawful objective; most modern statutes also require an overt act in furtherance (an act of mere preparation suffices). The traditional bilateral approach requires two guilty minds, while the MPC unilateral approach allows conviction even if the other party feigns agreement. Conspiracy does not merge into the completed crime.

Under the Pinkerton rule, a conspirator is liable for the substantive crimes of co-conspirators that are committed in furtherance of the conspiracy and are a reasonably foreseeable consequence of it. This can extend liability well beyond the crimes the defendant personally committed; the MPC rejects Pinkerton, limiting liability to crimes the defendant actually aided or solicited.

Attempt requires the specific intent to commit a crime plus a substantial step (MPC) or, at common law, an act dangerously close to completion (proximity test) beyond mere preparation. Factual impossibility is no defense, but legal impossibility (the intended act is not a crime) is a defense. Attempt merges into the completed offense, so a defendant cannot be convicted of both attempt and the substantive crime.

An accomplice is one who, with the intent to assist the principal and the intent that the crime be committed, aids, counsels, or encourages its commission; an accomplice is liable for the planned crime and all foreseeable crimes flowing from it. Mere presence or knowledge is insufficient. An accomplice may withdraw by repudiating encouragement, neutralizing prior assistance, or notifying authorities before the crime becomes unstoppable.

Jurisdictions apply differing insanity tests: the M'Naghten test (defendant could not know the nature of the act or that it was wrong due to a mental disease); the irresistible impulse test (defendant could not control conduct or conform it to law); the Durham product test (the act was a product of mental illness); and the MPC test (defendant lacked substantial capacity to appreciate criminality or to conform conduct to law). The defendant is presumed sane, and burdens of proof vary by jurisdiction.

Voluntary intoxication is a defense only to specific intent crimes, and only where it prevents the defendant from forming the required intent; it is no defense to general-intent, malice, or strict-liability crimes. Involuntary intoxication (unknowing or coerced ingestion) is treated like insanity and may be a defense to any crime if it negates the required mental state or meets the jurisdiction's insanity standard.

A person may use reasonable, non-deadly force to repel an imminent unlawful threat. Deadly force is justified only against a reasonable threat of death or serious bodily harm; the majority imposes no duty to retreat, while a minority requires retreat before deadly force if it can be done safely (with a castle exception at home). An initial aggressor regains the right only by withdrawing or where the victim escalates to deadly force. Defense of others permits force to protect a third person under the same conditions.

Reasonable non-deadly force may be used to defend property, but deadly force is never justified to protect property alone. Duress excuses a crime (other than intentional homicide) where the defendant reasonably believed another would imminently kill or seriously injure him or a third person unless he committed the crime. Necessity justifies criminal conduct reasonably taken to avoid a greater imminent harm caused by natural forces, where the harm avoided exceeds the harm caused.

Mistake of fact is a defense if it negates the required mens rea: any honest mistake suffices for specific intent crimes, but the mistake must be reasonable for general-intent and malice crimes, and it is no defense to strict-liability crimes. Mistake of law is generally no defense, even if reasonable, except where it negates a specific-intent element, the law was not reasonably available, or the defendant reasonably relied on an official interpretation.

Entrapment exists under the majority subjective test where the criminal design originated with law enforcement and the defendant was not predisposed to commit the crime; predisposition defeats the defense. The minority objective test asks instead whether police methods would induce an ordinary, law-abiding person to commit the crime. Merely providing an opportunity to commit the crime is not entrapment.

The Fourth Amendment applies only to government action and protects a person who has standing, requiring a reasonable expectation of privacy in the place or item searched (a personal right that cannot be vicariously asserted). No reasonable expectation exists in items knowingly exposed to the public, including bank records, dialed phone numbers, garbage left for collection, and open fields. A search also occurs when the government physically intrudes on a constitutionally protected area to obtain information.

An arrest must be supported by probable cause; police may arrest in public without a warrant, but need an arrest warrant to make a non-emergency arrest in the suspect's home. A seizure of the person occurs when a reasonable person would not feel free to leave and the person submits or is physically restrained. A brief investigatory stop requires only reasonable suspicion based on articulable facts.

A valid search warrant must be issued by a neutral and detached magistrate, be supported by probable cause (which may rest on an informant's tip evaluated under the totality of the circumstances), and particularly describe the place to be searched and items to be seized. Officers must generally knock and announce, though a violation does not trigger exclusion. Officers reasonably relying in good faith on a facially valid warrant later found defective are protected from exclusion.

Incident to a lawful arrest, police may search the arrestee's person and the area within his immediate control (wingspan) without a warrant, to protect officers and preserve evidence. For an occupant arrested in a vehicle, police may search the passenger compartment only if the arrestee is unsecured and within reach, or if it is reasonable to believe evidence of the crime of arrest is inside. Police generally may not search digital data on a seized cell phone without a warrant.

Under the automobile exception, police with probable cause to believe a vehicle contains contraband or evidence may search it without a warrant, including any container, compartment, or area where the object of the search might be found. The probable cause may arise after the stop, and the search may extend to the entire vehicle and containers belonging to passengers, so long as the scope matches the object sought.

Under the plain view doctrine, police may seize evidence without a warrant if they are lawfully present, the item is in plain view, and its incriminating nature is immediately apparent. A consent search is valid if consent is voluntary and given by one with actual or apparent authority; a co-occupant physically present and objecting can override another's consent. An inventory search of an impounded vehicle or arrestee's effects is valid if conducted under standardized procedures.

Under Terry v. Ohio, an officer may conduct a brief investigatory stop based on reasonable suspicion, supported by specific articulable facts, that criminal activity is afoot. The officer may conduct a limited frisk (pat-down of outer clothing) for weapons if there is reasonable suspicion the person is armed and dangerous. Under the plain feel doctrine, an item whose incriminating nature is immediately apparent by touch may be seized.

Exigent circumstances permit a warrantless entry or search where police face an emergency, including hot pursuit of a fleeing felon, imminent destruction of evidence, or risk to safety (emergency aid). The scope must be limited to the exigency, and police may not create the exigency through actual or threatened Fourth Amendment violations.

The exclusionary rule bars admission of evidence obtained in violation of the Fourth, Fifth, or Sixth Amendments in the prosecution's case-in-chief, and the fruit of the poisonous tree doctrine extends exclusion to evidence derivatively obtained. Exceptions allow admission where the connection is sufficiently attenuated, the evidence came from an independent source, or it would have been inevitably discovered. Illegally obtained evidence may still be used to impeach the defendant's trial testimony.

Under Miranda, statements from custodial interrogation are inadmissible in the prosecution's case-in-chief unless the suspect was warned of the right to remain silent, that statements may be used against him, and the right to counsel (appointed if indigent). Custody exists where a reasonable person would not feel free to leave to a degree associated with formal arrest, and interrogation includes words or conduct police should know are reasonably likely to elicit an incriminating response. A public-safety exception permits unwarned questioning to address an immediate threat.

A suspect may waive Miranda rights if the waiver is knowing, voluntary, and intelligent; silence alone is not a waiver. To invoke the right to counsel or silence, the suspect must do so unambiguously. Once counsel is invoked, all interrogation must cease and cannot resume without counsel present unless the suspect reinitiates, and that protection continues until 14 days after release from custody. After an invocation of silence, police must scrupulously honor it but may re-approach after a significant time lapse and fresh warnings.

Apart from Miranda, the Due Process Clause requires that any confession be voluntary, judged by the totality of the circumstances, and not the product of police coercion that overbears the suspect's will. An involuntary confession is inadmissible for all purposes, including impeachment, unlike a mere Miranda violation, which still permits impeachment use.

The Fifth Amendment privilege permits a person to refuse to give testimonial evidence that may be incriminating; it does not protect physical evidence such as blood, handwriting, or voice exemplars. A defendant may decline to testify and no adverse comment may be made on that silence. The privilege is lost if immunity coextensive with the privilege (use and derivative-use) is granted, after which the witness may be compelled to testify.

The Double Jeopardy Clause bars a second prosecution for the same offense after acquittal or conviction, and bars multiple punishments for it. Two crimes are the same offense unless each requires proof of an element the other does not (the Blockburger test). Jeopardy attaches when the jury is sworn or the first witness testifies in a bench trial. The separate sovereigns doctrine permits successive prosecutions by different sovereigns, such as state and federal governments.

The Sixth Amendment right to counsel attaches at the start of adversary judicial proceedings (formal charge, indictment, arraignment) and is offense-specific, applying only to the charged offense, unlike the broader Fifth Amendment Miranda right. It guarantees counsel at all critical stages of prosecution, including post-charge lineups, arraignment, and trial. A statement deliberately elicited about the charged offense after attachment, without counsel, is inadmissible.

Under Strickland v. Washington, a claim of ineffective assistance requires showing both that counsel's performance was deficient, falling below an objective standard of reasonableness, and that the deficiency caused prejudice, meaning a reasonable probability that the outcome would have differed. Courts apply a strong presumption that counsel's conduct fell within the range of reasonable professional assistance.

The Confrontation Clause guarantees a defendant the right to confront and cross-examine adverse witnesses. A testimonial hearsay statement by an unavailable declarant is inadmissible unless the defendant had a prior opportunity to cross-examine the declarant. Statements made to police primarily to address an ongoing emergency are non-testimonial; a defendant who wrongfully procures a witness's absence forfeits the objection.

A post-charge lineup or showup is a critical stage requiring the presence of counsel, but pre-charge identifications and photo arrays do not. An identification procedure also violates due process if it is so unnecessarily suggestive that it creates a substantial likelihood of misidentification. If a pretrial identification is excluded, an in-court identification is admissible only if shown to rest on an independent source.

The right to a speedy trial attaches at arrest or formal charge and is evaluated under a balancing of the length of and reason for delay, the defendant's assertion of the right, and prejudice; the remedy for violation is dismissal with prejudice. The right to a jury trial applies to serious offenses (those carrying more than six months imprisonment), requires at least 6 jurors, and requires a unanimous verdict in both federal and state criminal trials. The jury pool must reflect a fair cross-section of the community.

Evidence is relevant if it has any tendency to make a fact of consequence more or less probable than it would be without the evidence (materiality & probative value). The bar is low: even a slight tendency suffices. All relevant evidence is admissible unless excluded by the Constitution, statute, or a specific rule; irrelevant evidence is never admissible.

A court may exclude relevant evidence if its probative value is substantially outweighed by a danger of unfair prejudice, confusing the issues, misleading the jury, undue delay, wasting time, or needlessly presenting cumulative evidence. The proponent gets the benefit of the doubt because exclusion requires the danger to substantially outweigh probative value. This is the chief discretionary screen for otherwise-admissible evidence.

Evidence of measures taken after an injury that would have made the harm less likely is inadmissible to prove negligence, culpable conduct, a product defect, or a need for warning. It may be admitted for other purposes such as proving ownership, control, or feasibility of precautions if disputed, or for impeachment. The policy is to encourage safety improvements without penalizing repairs.

Conduct or statements made during compromise negotiations of a disputed claim, and the offer to compromise itself, are inadmissible to prove the validity or amount of the claim or to impeach by prior inconsistent statement. There must be an actual dispute as to liability or amount. The evidence may be admitted for other purposes such as showing a witness's bias or negating a contention of undue delay.

Evidence of furnishing, offering, or promising to pay medical, hospital, or similar expenses resulting from an injury is inadmissible to prove liability for the injury. Unlike Rule 408, only the payment/offer itself is excluded; accompanying admissions of fact remain admissible because no disputed-claim or negotiation context is required.

In any proceeding, evidence of a withdrawn guilty plea, a nolo contendere plea, statements made during plea proceedings, and statements made in plea negotiations with a prosecutor that do not result in a guilty plea are inadmissible against the defendant who made them. A final, unwithdrawn guilty plea is admissible. The defendant may waive these protections.

Evidence that a person was or was not insured against liability is inadmissible to prove whether the person acted negligently or otherwise wrongfully. It may be admitted for other purposes, such as proving agency, ownership, control, or a witness's bias or prejudice.

Evidence of a person's character or character trait is generally inadmissible to prove that the person acted in accordance with that character on a particular occasion (the propensity inference). The rule reflects the fear that jurors will overweight character and punish bad people regardless of the facts. Key exceptions exist for the criminal defendant, the alleged victim, and witnesses.

A criminal defendant may open the door by offering evidence of a pertinent good character trait, after which the prosecution may rebut. A defendant may also offer evidence of the victim's pertinent trait (e.g., violence in a self-defense case); the prosecution may then rebut with the victim's same trait and the defendant's same trait. In homicide cases, once the defendant claims the victim was the first aggressor, the prosecution may offer evidence of the victim's peacefulness.

Evidence of other crimes, wrongs, or acts is inadmissible to prove propensity but is admissible for non-character purposes such as Motive, Intent, absence of Mistake, Identity, or Common plan (MIMIC), plus opportunity, knowledge, and preparation. The prosecution must give pretrial notice on request, and the proof need only support a finding by a preponderance that the act occurred. The act is still subject to Rule 403 balancing.

When character is admissible, it may ordinarily be proved by reputation or opinion testimony; on cross-examination inquiry into relevant specific instances of conduct is allowed. Specific instances on direct are permitted only when character is an essential element of a charge, claim, or defense (e.g., defamation, entrapment, negligent hiring).

Evidence of a person's habit or an organization's routine practice is admissible to prove that conduct on a particular occasion conformed to the habit or routine. Unlike character, habit describes a specific, semi-automatic response to a particular, repeated situation. It needs no corroboration and no eyewitness.

In civil or criminal cases involving sexual assault or child molestation, evidence that the party committed other such offenses is admissible and may be considered for any relevant matter, including propensity. This is a deliberate exception to Rule 404(a)'s ban. The evidence remains subject to Rule 403 balancing.

A witness may be impeached with a prior statement inconsistent with present testimony to show the witness is unreliable. Generally extrinsic evidence is allowed only if the witness is given an opportunity to explain or deny and the opponent may examine, unless justice requires otherwise (foundation may come later). A prior inconsistent statement is substantive evidence (not hearsay) only if it was made under oath at a prior proceeding.

A witness may always be impeached by showing bias, interest, or a motive to lie (e.g., a financial stake, family relationship, plea deal, or hostility). Bias is not collateral, so extrinsic evidence is permitted, though most courts require a foundation by first asking the witness. Bias is one of the most potent impeachment tools because it goes directly to credibility.

For any witness, a conviction involving a dishonest act or false statement (crimen falsi) must be admitted with no balancing. Other felonies are admissible subject to balancing: for a criminal defendant-witness the conviction comes in only if probative value outweighs prejudice; for other witnesses ordinary Rule 403 applies. Convictions older than 10 years (from conviction or release) are presumptively inadmissible absent special justification.

On cross-examination, a witness may be questioned about specific instances of conduct that are probative of truthfulness or untruthfulness (e.g., lying on a job application). Extrinsic evidence is prohibited; the examiner must take the witness's answer. The act must not have resulted in a conviction (that triggers Rule 609 instead) and the questioner must have a good-faith basis.

A witness's credibility may be attacked or supported by reputation or opinion testimony about the witness's character for truthfulness. Evidence of truthful character is admissible only after the witness's character for truthfulness has been attacked. This is one of the few times a witness's general character is fair game.

A witness may be impeached by contradiction—showing the witness was wrong about a fact. Extrinsic evidence is permitted to contradict on a non-collateral matter (one relevant to the case or to a recognized impeachment ground), but not to contradict on a purely collateral point. The collateral-matter rule prevents trials from devolving into mini-trials on trivia.

Once a witness is impeached, the proponent may rehabilitate. Permissible methods include offering reputation/opinion evidence of truthful character after a character attack (608(a)) and offering a prior consistent statement to rebut a charge of recent fabrication or improper motive or to rehabilitate on another basis. A qualifying prior consistent statement is admissible as substantive evidence, not just to rehabilitate.

Every person is presumed competent to testify; the witness must have personal knowledge of the matter and must take an oath or affirmation to testify truthfully. In diversity cases, state competency rules apply to elements governed by state law. The Dead Man's Statute (in some states) bars an interested party from testifying about a transaction with a now-deceased person.

A lay witness may give an opinion that is rationally based on the witness's perception, helpful to understanding the testimony or determining a fact, and not based on specialized knowledge. Classic permissible lay opinions include speed, intoxication, emotional state, and identity. The opinion cannot be a disguised expert opinion.

A qualified expert may testify if (1) specialized knowledge will help the trier of fact, (2) the testimony rests on sufficient facts or data, (3) it is the product of reliable principles and methods, and (4) the expert reliably applied them. Under Daubert, the judge is a gatekeeper assessing reliability via testing, peer review, error rate, and acceptance. An expert may rely on inadmissible facts if experts in the field reasonably do so.

Statements in a published treatise, periodical, or pamphlet are admissible as substantive evidence (an exception to hearsay) if called to an expert's attention on cross or relied on during direct, and the publication is established as a reliable authority. The relevant statements may be read into evidence but not received as an exhibit, preventing the jury from over-relying on the document.

Hearsay is an out-of-court statement (an oral/written assertion or assertive conduct) offered to prove the truth of the matter asserted. Hearsay is inadmissible unless an exception or exclusion applies. A statement offered for a non-truth purpose—effect on the listener, notice, verbal act/legally operative words, or state of mind—is not hearsay.

A declarant-witness's prior statement is not hearsay (treated as exclusion) if the witness testifies and is subject to cross, and the statement is: a prior inconsistent statement made under oath at a proceeding; a prior consistent statement offered to rebut a charge of recent fabrication/improper motive or to rehabilitate; or a statement of identification of a person the witness perceived earlier. These come in as substantive evidence.

A statement offered against a party is not hearsay if it is the party's own statement, one the party adopted or believed true (adoptive admission, including silence where a reasonable person would object), one by an authorized spokesperson, one by an agent/employee on a matter within scope made during employment (vicarious), or one by a co-conspirator during and in furtherance of the conspiracy. No personal knowledge or against-interest requirement applies.

A statement describing or explaining an event or condition, made while or immediately after the declarant perceived it, is admissible regardless of the declarant's availability. The near-contemporaneity reduces the risk of fabrication. No startling event is required.

A statement relating to a startling event or condition, made while the declarant was under the stress of excitement the event caused, is admissible regardless of availability. The stress is presumed to suspend the capacity for reflective fabrication. The statement may be broader than a mere description and can come some time after the event so long as stress persists.

A statement of the declarant's then-existing state of mind, emotion, sensation, or physical condition (e.g., intent, plan, motive, pain) is admissible. A statement of present intent is admissible to prove the declarant later acted in accordance with that intent. It generally does not cover a statement of memory or belief to prove the fact remembered, except as to a will.

A statement made for and reasonably pertinent to medical diagnosis or treatment, describing medical history, symptoms, or their general cause, is admissible regardless of availability. The declarant need not be the patient and the listener need not be a physician. Statements of fault are generally excluded, though the cause of injury may be admissible (and identity of an abuser is allowed in domestic-abuse contexts).

A record on a matter the witness once knew but now cannot recall well enough to testify fully is admissible if the record was made or adopted when fresh in the witness's memory and accurately reflects that knowledge. The record may be read into evidence but received as an exhibit only if offered by the adverse party. Distinguish from present recollection refreshed, where the writing merely jogs memory and is not evidence.

A record of an act, event, condition, opinion, or diagnosis is admissible if (1) made at or near the time by someone with knowledge, (2) kept in the regular course of a regularly conducted activity, (3) making the record was a regular practice, shown by a custodian or certification. It is excluded if the source or method indicates a lack of trustworthiness. Records prepared primarily for litigation are untrustworthy.

A record of a public office is admissible if it sets out the office's activities, a matter observed under a legal duty (but not, in a criminal case, police observations against the defendant), or factual findings from a legally authorized investigation (against the government in criminal cases, or in civil cases). It is excluded if circumstances indicate a lack of trustworthiness.

A declarant is unavailable if exempted by privilege, refuses to testify despite a court order, testifies to not remembering, cannot testify due to death or infirmity, or is absent and cannot be subpoenaed/procured. Unavailability is not established if the proponent wrongfully caused it to prevent the testimony.

Testimony given as a witness at a prior trial, hearing, or deposition is admissible against a party who had an opportunity and similar motive to develop it by direct, cross, or redirect. In civil cases, a predecessor in interest with similar motive suffices. The prior and current proceedings need not be identical, only the motive similar.

A statement made by a declarant while believing death was imminent, concerning the cause or circumstances of the impending death, is admissible. It applies only in civil cases and criminal homicide prosecutions. The declarant must be unavailable but need not actually die; the genuine belief in imminent death is what matters.

A statement that, when made, was so contrary to the declarant's proprietary, pecuniary, or penal interest that a reasonable person would not have made it unless true, is admissible. A statement exposing the declarant to criminal liability and offered to exculpate the accused needs corroborating circumstances showing trustworthiness. Unlike a party admission, the declarant must be unavailable and have personal knowledge.

A statement offered against a party who wrongfully caused—or acquiesced in wrongfully causing—the declarant's unavailability, and did so intending that result, is admissible. The party forfeits both the hearsay objection and the Confrontation Clause objection. This prevents litigants from profiting by silencing witnesses.

A hearsay statement not covered by a specific exception may still be admitted if it has sufficient guarantees of trustworthiness (considering totality of circumstances and corroborating evidence) and is more probative on the point than other reasonably available evidence. The proponent must give the adverse party reasonable notice. It is a narrow catch-all used sparingly.

The Confrontation Clause bars admission of a testimonial hearsay statement against a criminal defendant unless the declarant is unavailable and the defendant had a prior opportunity to cross-examine. A statement is testimonial if its primary purpose was to establish or prove past facts for later prosecution (e.g., police interrogation absent an ongoing emergency); statements to address an ongoing emergency are nontestimonial. The clause applies even when a hearsay exception would otherwise admit the statement.

A confidential communication between a client and attorney (or their representatives) made to facilitate legal services is privileged and protected from disclosure. The privilege belongs to the client, survives the client's death, and is waived by disclosure to third parties. It does not apply to communications made to further a crime or fraud (crime-fraud exception) and protects communications, not underlying facts.

Materials prepared in anticipation of litigation by or for a party or its representative are protected work product. Ordinary work product is discoverable only on a showing of substantial need and undue hardship; opinion work product (an attorney's mental impressions, conclusions, and legal theories) receives near-absolute protection. It is a qualified immunity, broader than the attorney-client privilege because it covers material from any source prepared for litigation.

Spousal testimonial privilege allows a witness-spouse to refuse to testify against a defendant-spouse in a criminal case; it lasts only during marriage and is held by the witness-spouse (federal majority). Marital confidential communications privilege protects confidential communications made during marriage, applies in civil and criminal cases, survives divorce, and is held by both spouses. Neither applies in suits between the spouses or in cases of crimes against the spouse or children.

The psychotherapist-patient privilege (recognized in federal court) protects confidential communications made for diagnosis or treatment of a mental condition. A general physician-patient privilege exists only by state statute and typically requires the information be acquired for treatment. Both are waived when the patient puts the condition at issue (e.g., a personal-injury claim).

To authenticate, the proponent must produce evidence sufficient to support a finding that the item is what the proponent claims (a low, conditional-relevance threshold for the jury). Methods include witness testimony, distinctive characteristics, comparison by expert or jury, handwriting, voice identification, and process/system reliability. Certain items are self-authenticating (e.g., public documents under seal, certified records, newspapers, trade inscriptions) and need no extrinsic foundation.

To prove the content of a writing, recording, or photograph, the party must produce the original (or a duplicate, which is admissible unless authenticity is genuinely disputed or it would be unfair). The rule applies only when the content itself is at issue or a witness relies on the writing—not when a fact exists independently of any writing. Secondary evidence is allowed if the original is lost, destroyed (not in bad faith), unobtainable, or in the opponent's control.

A court may take judicial notice of an adjudicative fact that is not subject to reasonable dispute because it is either generally known within the jurisdiction or readily verifiable from sources whose accuracy cannot reasonably be questioned. Notice is mandatory if requested with the necessary information. In a civil case the jury must accept the fact as conclusive; in a criminal case the jury may but need not accept it.

A presumption imposes on the party against whom it is directed the burden of producing evidence to rebut it. Under the federal (Thayer bursting-bubble) approach, once the opponent introduces sufficient rebuttal evidence the presumption disappears, though the underlying inference may remain. The burden of persuasion does not shift and stays with the party who originally bore it.

A fee simple absolute is the largest possible estate, of potentially infinite duration, with no accompanying future interest. It is freely devisable, descendible, and alienable. Modern conveyances of land are presumed to pass a fee simple absolute unless the grantor clearly states otherwise; words like to A and his heirs are unnecessary today.

A fee simple determinable is created by durational language (so long as, while, during, until) and automatically terminates upon the stated event, with the estate reverting to the grantor. The grantor retains a possibility of reverter. Because the grantee's estate ends by its own terms, no re-entry is needed.

A fee simple subject to condition subsequent is created by conditional language (provided that, but if, on condition that) coupled with an express right to re-enter. The estate does not automatically end; the grantor retains a right of entry (power of termination) and must affirmatively act to retake possession. Courts construe ambiguous grants as this estate to avoid automatic forfeiture.

A fee simple subject to an executory interest automatically terminates upon a stated event and passes to a third party rather than reverting to the grantor. The third party holds an executory interest. The shift to a transferee, not the grantor, is what distinguishes it from a determinable fee.

A fee tail (to A and the heirs of his body) historically kept land within a bloodline; nearly all states have abolished it, converting it into a fee simple absolute. A life estate is measured by the life of one or more persons (often the grantee, or another under a life estate pur autre vie) and ends at death, with the property passing to a reversion or remainder.

A life tenant (and similarly situated possessor) must not commit waste that harms the future interest holders. Voluntary (affirmative) waste is willful destruction or exploitation of resources; permissive waste is failure to maintain, repair, or pay taxes/interest; ameliorative waste is a change that increases value but alters the property's character, generally actionable absent consent or changed conditions. The open mines doctrine permits continued extraction from mines already open at the estate's creation.

A reversion is the future interest left in a grantor who conveys an estate smaller than the one held (e.g., grants a life estate). A possibility of reverter follows a fee simple determinable and is automatic. A right of entry (power of termination) follows a fee simple subject to condition subsequent and must be exercised. Reversions and possibilities of reverter are not subject to RAP.

A remainder is a future interest in a third party that becomes possessory naturally upon the expiration of a prior estate (usually a life estate). It is vested if held by an ascertained person with no condition precedent; it is contingent if given to an unascertained person or subject to a condition precedent. A vested remainder subject to open exists when a class can still grow.

An executory interest is a future interest in a third party that cuts short or divests a prior estate rather than waiting for its natural end. A shifting executory interest divests a transferee; a springing executory interest divests the grantor after a gap. Executory interests are subject to the Rule Against Perpetuities.

Under RAP, a contingent remainder, executory interest, or vested remainder subject to open is void if it might not vest or fail within 21 years after a life in being at the interest's creation. If there is any possibility, however remote, of late vesting, the interest is stricken. Many states soften the rule via wait-and-see (judge validity by actual events) or the USRAP 90-year cy pres period.

A class gift vests in members of a described group; the class closes under the rule of convenience when any member is entitled to immediate possession, excluding the later-born. Under RAP, the all-or-nothing rule voids the entire class gift if it might be invalid as to any potential member. The fertile octogenarian and similar fictions can trip up class gifts.

A joint tenancy features the right of survivorship: on a joint tenant's death the share passes automatically to survivors, bypassing probate. Creation requires the four unities—Time, Title, Interest, and Possession—plus a clear expression of survivorship, since modern law presumes a tenancy in common. Each joint tenant holds an equal, undivided interest.

A joint tenancy is severed—destroying survivorship and creating a tenancy in common as to that share—by an inter vivos conveyance of a joint tenant's interest. A mortgage severs only in title-theory states (not lien-theory); a lease and a contract of sale may sever depending on the jurisdiction. A joint tenant's will cannot defeat survivorship because the interest vanishes at death before the will operates.

A tenancy in common is the default concurrent estate: each holder owns a separate, undivided, freely transferable share with no survivorship. A tenancy by the entirety exists only between married spouses (where recognized), carries survivorship, and cannot be severed by one spouse acting alone; a creditor of only one spouse generally cannot reach the property.

Each co-tenant has a right to possess the whole; one who excludes another commits ouster. A co-tenant in sole possession need not pay rent absent ouster, but must account for net rents from third parties and share carrying costs (taxes, mortgage) proportionally, with contribution for necessary repairs but generally not for improvements. Any co-tenant may seek partition in kind or by sale.

A tenancy for years lasts a fixed term and ends automatically without notice. A periodic tenancy renews automatically period-to-period and requires notice (commonly one period, capped at six months for year-to-year) to terminate. A tenancy at will may be ended by either party at any time; a tenancy at sufferance arises when a holdover tenant wrongfully remains after the lease ends.

An assignment transfers the tenant's entire remaining interest; the assignee is in privity of estate with the landlord and liable for rent, while the original tenant remains liable in privity of contract. A sublease transfers less than the entire interest, creating no privity between sublessee and landlord. A clause barring assignment does not bar subletting, and once a landlord consents to one transfer the Rule in Dumpor's Case may waive the restriction.

The landlord must deliver possession (majority/English rule requires actual possession) and not interfere with the tenant's quiet enjoyment. The tenant must pay rent and avoid waste. At common law the duties were independent, but modern law increasingly treats key obligations (rent vs. habitability) as dependent covenants.

In residential leases, the landlord impliedly warrants the premises are fit for human habitation (meeting housing-code and bare-living standards); this warranty is non-waivable. On material breach the tenant may move out and terminate, repair and deduct, reduce or withhold rent, or remain and sue for damages. It does not apply to commercial leases.

Constructive eviction occurs when the landlord's breach of a duty substantially interferes with the tenant's use and enjoyment, rendering the premises uninhabitable. The tenant must show SING: Substantial interference, Notice to the landlord who fails to cure, and Goodbye—the tenant must actually vacate within a reasonable time. Only then is the tenant relieved of rent.

If a tenant abandons, the landlord may treat it as an offer of surrender and accept (ending the lease) or hold the tenant liable for rent. Most jurisdictions now require the landlord to mitigate damages by making reasonable efforts to re-let; a landlord who re-lets on the tenant's behalf may recover any deficiency. The traditional rule imposed no duty to mitigate.

A landlord may not evict or penalize a residential tenant in retaliation for the tenant's lawful conduct such as reporting housing-code violations or asserting habitability rights. Many statutes create a presumption of retaliation if adverse action follows the protected activity within a set period (often 90-180 days). The doctrine protects tenants who enforce the implied warranty of habitability.

An express easement must satisfy the Statute of Frauds (writing); an easement may also arise by implication from prior use (apparent, continuous, and reasonably necessary use existing before severance of common ownership), by necessity (strict necessity from severance creating landlocked parcel), or by prescription (open, notorious, continuous, hostile use for the statutory period, akin to adverse possession). An easement may be appurtenant (benefits a parcel) or in gross (benefits a person).

The scope of an easement is set by its terms or the circumstances of creation and may evolve with reasonable, foreseeable changes, but it cannot be expanded to benefit a non-dominant parcel (surcharge). Easements terminate by release, merger (unity of ownership), abandonment shown by intent plus conduct, estoppel, prescription, end of necessity, or destruction of the servient estate. Mere non-use does not terminate an easement.

A profit is the right to enter another's land and remove resources (minerals, timber, game) and is governed by easement rules. A license is a revocable, personal permission to use land that need not satisfy the Statute of Frauds. A license becomes irrevocable (easement by estoppel) when the licensee, with the licensor's knowledge, makes substantial good-faith improvements in reliance.

A real covenant is a written promise about land use that, to run with the land at law for damages, requires WITHN: a Writing, Intent to bind successors, the covenant to Touch & concern the land, Horizontal & vertical privity (for the burden), and Notice to the burdened successor. The burden side has stricter requirements (horizontal privity and full vertical privity) than the benefit side.

An equitable servitude is a land-use promise enforced in equity by injunction, requiring only a Writing (subject to the common-scheme exception), Intent to bind successors, Touch & concern, and Notice (actual, record, or inquiry)—but no privity. Equitable servitudes are easier to enforce than real covenants because they drop the privity requirements. Defenses include changed conditions and unclean hands.

Under the common (general) scheme doctrine, an equitable servitude may be implied and enforced against a lot owner even without a writing in that owner's deed if (1) the developer had a common scheme of restriction at the time of sales and (2) the owner had notice of the restriction. Notice may be actual, record, or inquiry (from the neighborhood's uniform character). This permits reciprocal enforcement among subdivision purchasers.

A land-sale contract must be in writing, signed by the party to be charged, and identify the parties, land, and price. The part performance exception may enforce an oral contract where the buyer shows two of three: possession, payment of all or part of the price, and valuable improvements. Detrimental reliance/estoppel may also remove the bar.

Every land-sale contract contains an implied covenant of marketable title—title reasonably free of doubt and the threat of litigation—at closing. Title may be unmarketable due to defects in the chain, encumbrances (liens, easements, covenants, encroachments), or title acquired by adverse possession not yet quieted. The buyer must notify the seller and allow a reasonable time to cure before closing.

Under equitable conversion, once a contract is signed the buyer is treated as the equitable owner and bears the risk of loss if the property is damaged or destroyed without fault before closing (majority rule). The seller retains legal title in trust and is entitled to the purchase price. The Uniform Vendor and Purchaser Risk Act (minority) shifts risk to whoever has possession or title.

A builder-vendor of a new home impliedly warrants that it was constructed in a workmanlike manner and is fit for habitation; many jurisdictions extend this to subsequent purchasers. Under the merger doctrine, contract obligations regarding title generally merge into the deed at closing, so the buyer must thereafter sue on the deed covenants rather than the contract (though collateral promises and warranties may survive).

A general warranty deed warrants against all defects, containing the present covenants of seisin, right to convey, and against encumbrances and the future covenants of quiet enjoyment, warranty, and further assurances. A special warranty deed warrants only against defects arising during the grantor's ownership. A quitclaim deed conveys whatever interest the grantor has with no covenants of title.

A deed is effective only upon delivery, which turns on the grantor's present intent to make the deed operative—not necessarily physical handing over. Delivery is presumed if the deed is recorded or handed to the grantee, and negated if the grantor retains the deed or an effective right to recall it. Acceptance by the grantee is presumed when the gift is beneficial. A condition to delivery noted only orally is generally disregarded once delivery to the grantee occurs.

A race statute protects whoever records first, regardless of notice. A notice statute protects a subsequent bona fide purchaser who takes without notice of a prior unrecorded interest, even if she never records. A race-notice statute protects a subsequent BFP who takes without notice and records first. Recording acts resolve priority between competing claimants to the same land.

A bona fide purchaser (BFP) takes for valuable consideration without notice of a prior interest; donees, heirs, and devisees are not protected. Notice may be actual, record/constructive (a properly recorded instrument in the chain), or inquiry (facts—such as a possessor on the land—that would prompt a reasonable buyer to investigate). A purchaser with any form of notice cannot prevail under notice or race-notice acts.

Under the shelter rule, a person who takes from a BFP acquires the BFP's protected status, even if that person had notice. A wild deed—recorded outside the chain of title—gives no constructive notice because a searcher cannot find it. Under estoppel by deed, a grantor who conveys land he does not yet own but later acquires is estopped to deny the grantee's title, and the after-acquired title passes automatically.

A mortgage secures a debt with an interest in real property. In lien-theory states (majority), the mortgagee holds only a lien and the mortgagor retains title and possession until foreclosure. In title-theory states the mortgagee holds legal title until the debt is paid. The distinction matters for whether a mortgage by one joint tenant severs the joint tenancy.

A mortgagor may transfer the encumbered land; the mortgage remains attached and follows the property. If the grantee takes subject to the mortgage, she is not personally liable but the land can be foreclosed; if she assumes the mortgage, she becomes personally liable and the original mortgagor remains secondarily liable as a surety. A due-on-sale clause may let the lender demand full payment upon transfer.

Foreclosure (usually by judicial sale) extinguishes the foreclosing lien and all junior interests, which are paid from surplus by priority; senior interests survive. Priority generally follows first in time, first in right as modified by recording acts. A purchase-money mortgage—given to secure funds used to buy the property—takes priority over prior claims against the buyer and even over earlier-recorded judgment liens.

Equitable redemption allows the mortgagor to cure the default and reclaim the land by paying the debt (plus interest/costs) before the foreclosure sale; this right cannot be waived in the mortgage (no clogging the equity of redemption). Many states also grant a statutory right of redemption allowing the mortgagor to redeem for a set period after the sale by paying the foreclosure-sale price.

Title may be acquired by adverse possession when possession is Continuous, Open & notorious, Actual & exclusive, and Hostile (without permission) for the statutory period (COAH). Tacking permits successive possessors in privity to combine their periods, and the clock is tolled for disabilities (minority, insanity, imprisonment) existing at the start. Adverse possession does not run against government land.

A fixture is a chattel so annexed to realty that it is treated as part of the land and passes with a conveyance. Courts weigh the degree of attachment, adaptation to the property's use, and the annexer's objective intent. A tenant's trade fixtures may be removed before the lease ends if removal does not cause substantial damage; the accession/agreement of the parties controls where stated.

Under the riparian doctrine (eastern states), owners of land bordering a watercourse share rights to reasonable use that does not unreasonably interfere with downstream users. Under prior appropriation (western states), rights go to whoever first makes beneficial use, on a first-in-time basis regardless of land location. For groundwater, jurisdictions apply reasonable-use or absolute-ownership rules; surface water follows common-enemy, natural-flow, or reasonable-use approaches.

A landowner has a right to lateral support from adjoining land; an excavator is strictly liable for damage to land in its natural state, but liable only for negligence as to damage caused by the weight of buildings (unless the land would have collapsed even without them). Subjacent support protects a surface owner against a subsurface holder (e.g., a mineral rights owner), who is liable for withdrawing support that causes subsidence.

Intent is satisfied when the defendant acts with the purpose of causing the tortious result or knows that the result is substantially certain to follow. Under transferred intent, intent carries over when the defendant intends one of the five original trespass torts (battery, assault, false imprisonment, trespass to land, trespass to chattels) but instead commits a different one of those torts or harms a different victim. The defendant need not intend the specific harm, only the contact or apprehension; mistake as to identity or consequences is no defense.

Battery is an intentional harmful or offensive contact with the plaintiff's person. Offensiveness is judged by an objective reasonable person standard, and contact with anything closely connected to the plaintiff (such as clothing or an item being held) counts as contact with the person. No actual damages are required because the plaintiff may recover nominal damages, and the plaintiff need not be aware of the contact at the time it occurs.

Assault is an intentional act causing the plaintiff to suffer a reasonable apprehension of an imminent harmful or offensive contact. The plaintiff must have actual awareness, apprehension means anticipation rather than fear, and words alone are generally insufficient unless coupled with conduct. Threats of future harm do not qualify, and the defendant's apparent ability to carry out the contact suffices even if the defendant lacks actual ability.

False imprisonment is an intentional act that confines or restrains the plaintiff to a bounded area against the plaintiff's will. Confinement may be achieved by physical barriers, force, threats, or failure to release, but a reasonable means of safe escape the plaintiff is aware of defeats the claim. The plaintiff must be aware of the confinement or be harmed by it, and the area is not bounded if there is a reasonable exit.

IIED requires extreme & outrageous conduct that intentionally or recklessly causes the plaintiff severe emotional distress. The conduct must exceed all bounds of decency tolerated in a civilized society, and unlike other intentional torts, actual severe distress (not nominal damages) must be proven. For bystander claims, the plaintiff must generally be present, be a close relative, and the defendant must know of these facts, though presence and relationship may be relaxed if the conduct was directed at the bystander.

Trespass to land is an intentional physical invasion of the plaintiff's real property. The defendant need only intend to enter the land, not to trespass, so mistake about ownership is no defense. The invasion may be by the person, by causing a physical object to enter, or by remaining after a privilege ends; intangible intrusions like noise or odor are addressed through nuisance rather than trespass.

Trespass to chattels is an intentional interference with the plaintiff's right of possession through minor dispossession or damage, with damages measured by the harm or loss of use. Conversion is a more serious interference so substantial that the defendant must pay the chattel's full market value (a forced sale). The distinction turns on the degree of interference, including duration of control, extent of harm, and the defendant's good faith.

Consent is a complete defense and may be express or implied from custom, conduct, or the circumstances (objective manifestation). Consent obtained by fraud, duress, or mistake as to an essential matter is invalid, and a person lacking capacity (due to youth, intoxication, or incompetence) cannot effectively consent. The defendant's conduct must stay within the scope of the consent given, and consent to a criminal act is treated differently across jurisdictions.

A person may use reasonable force to defend against what is reasonably believed to be an imminent threat of harmful or offensive contact. Deadly force is permitted only against a threat of death or serious bodily harm, and the modern majority imposes no duty to retreat before using non-deadly force. A reasonable mistake about the need to defend does not destroy the privilege, and defense of others applies on the same terms as defending oneself.

A possessor may use reasonable non-deadly force to defend property after first requesting the intruder to desist, unless the request would be futile or dangerous. Deadly force or traps may never be used solely to protect property. Recapture of chattels permits reasonable force only in hot pursuit of a wrongful taker; if the original taking was lawful or the goods are held by an innocent party, the owner must resort to legal process.

Public necessity is an absolute defense permitting the defendant to injure or destroy property to protect the community from imminent disaster, with no liability for the damage caused. Private necessity is a qualified defense allowing entry or interference to protect the defendant's own interests, but the defendant must pay for actual harm caused. Under private necessity the landowner may not lawfully expel the defendant while the emergency persists.

A private citizen may arrest for a felony if a felony was in fact committed and the citizen reasonably believes the arrestee committed it, but a reasonable mistake as to the perpetrator's identity is protected only when a felony actually occurred. For a misdemeanor, a citizen may arrest only for a breach of the peace committed in the citizen's presence. Police officers receive broader protection, including for reasonable mistakes about whether a felony occurred.

A defendant owes a duty of reasonable care to all foreseeable plaintiffs who may be injured by the defendant's failure to act with due care. Under the majority Cardozo view from Palsgraf, duty extends only to those within the zone of foreseeable danger. Under the minority Andrews view, a duty is owed to anyone harmed once the defendant acts negligently toward anyone, with foreseeability addressed at the proximate-cause stage.

The default standard is that of a reasonably prudent person under like circumstances, an objective measure that ignores the defendant's individual shortcomings such as low intelligence or carelessness. The defendant's superior skill or knowledge is considered, physical disabilities are accounted for, and children are held to the standard of a child of like age, intelligence, and experience (except when engaged in adult or inherently dangerous activities). Professionals are held to the knowledge and skill of an average member of their profession.

Breach occurs when the defendant's conduct falls below the applicable standard of care. Under the Hand formula, conduct is unreasonable if the burden of taking precautions (B) is less than the probability of harm (P) multiplied by the gravity of the loss (L), i.e., breach exists when B < P x L. The plaintiff must identify the specific careless act and explain why a reasonable person would not have done it.

Actual (factual) cause is normally shown by the but-for test: the harm would not have occurred but for the defendant's conduct. When multiple sufficient causes combine and either alone would have caused the harm, the substantial-factor test applies and each defendant is liable. Where two or more defendants act negligently but only one caused the harm and the plaintiff cannot identify which, the burden shifts to defendants to exculpate themselves under alternative liability.

Proximate cause limits liability to harms that are a foreseeable result of the defendant's negligence, cutting off liability for freakish or remote consequences. A defendant is generally liable for the foreseeable consequences of the risk created, and under the eggshell-plaintiff rule the defendant takes the victim as found and is liable for the full extent of harm even if unforeseeably severe. Direct-cause cases impose liability for foreseeable harms; indirect-cause cases turn on foreseeable intervening forces.

An intervening cause is a force arising after the defendant's negligence that contributes to the plaintiff's harm. A foreseeable intervening cause does not relieve the defendant of liability, whereas an unforeseeable, independent intervening cause is superseding and breaks the chain of causation. Foreseeable intervening forces commonly include ordinary negligent rescue, subsequent medical malpractice, and reactions to danger, while unforeseeable criminal acts or acts of nature may sever liability.

Actual damages are an essential element of negligence, so nominal damages are unavailable. The plaintiff may recover for personal injury (medical costs, lost earnings, and pain and suffering) and property damage measured by reasonable repair cost or fair market value. The plaintiff must take reasonable steps to mitigate damages, the collateral source rule traditionally bars reducing recovery by benefits from independent sources, and punitive damages require wanton, willful, or malicious conduct.

Negligence per se permits a criminal or regulatory statute to set the standard of care when the plaintiff is within the class of persons the statute protects and the harm is of the type the statute was designed to prevent. An unexcused violation conclusively establishes duty & breach, though the plaintiff must still prove causation and damages. Violation may be excused where compliance would be more dangerous or was impossible under the circumstances.

Res ipsa loquitur lets the plaintiff establish a circumstantial inference of breach where the accident is of a type that ordinarily does not occur absent negligence and the instrumentality was within the defendant's exclusive control. The plaintiff must also show the injury was not due to the plaintiff's own conduct. Successful invocation defeats a directed verdict for the defendant by allowing the jury to infer breach, but it does not shift the burden of proof in most jurisdictions.

Under the traditional approach, a land possessor owes no duty to undiscovered trespassers, but must warn discovered or anticipated trespassers of known, hidden, artificial dangers. To licensees (social guests), the possessor must warn of known concealed dangers and exercise reasonable care in active operations. To invitees (those entering for the possessor's business or land open to the public), the possessor owes a duty to inspect for and make safe non-obvious dangerous conditions.

Under the attractive-nuisance doctrine, a land possessor owes a duty of reasonable care to child trespassers if a dangerous artificial condition exists where children are likely to trespass, the possessor knows or should know of it, and the children cannot appreciate the risk because of their youth. The possessor is liable if the magnitude of the risk outweighs the utility of the condition and the cost of remedying it. The child need not actually be lured by the condition.

There is generally no duty to act affirmatively to aid or rescue another. Exceptions arise where the defendant created the peril, has a special relationship with the plaintiff (such as common carrier-passenger, innkeeper-guest, or custodian), or voluntarily undertakes a rescue and must then proceed with reasonable care. A defendant who begins to assist may be liable for negligent performance or for leaving the plaintiff in a worse position, though Good Samaritan statutes often limit this liability.

Negligent infliction of emotional distress traditionally requires the plaintiff to be within the zone of danger and to suffer a physical manifestation of distress; many courts also allow recovery for bystanders who are close relatives, present at the scene, and personally observe the injury. The pure economic loss rule bars recovery in negligence for purely financial harm unaccompanied by personal injury or property damage, channeling such claims into contract or product-liability doctrines.

Under traditional contributory negligence, any negligence by the plaintiff is a complete bar to recovery, now retained in only a few jurisdictions. Pure comparative negligence reduces the plaintiff's recovery by the plaintiff's percentage of fault, allowing recovery even if the plaintiff is mostly at fault. Modified comparative negligence reduces recovery by the plaintiff's share but bars recovery once the plaintiff's fault reaches 50% or 51%, depending on the jurisdiction.

Express assumption of risk through a valid waiver bars recovery unless void as against public policy. Implied assumption of risk requires that the plaintiff knew of the risk and voluntarily encountered it; many comparative-fault jurisdictions have merged this into the comparative analysis. Last clear chance is a plaintiff's rebuttal to contributory negligence, allowing recovery where the defendant had the final opportunity to avoid the harm but failed to use it.

An owner is strictly liable for harm caused by wild animals resulting from a dangerous propensity characteristic of the species, even when the owner exercised utmost care. For domestic animals, the owner is liable only with knowledge of a particular animal's dangerous propensities abnormal for its class (the one-bite concept), though ordinary negligence liability may still apply. Trespassers generally cannot recover under strict liability for animal injuries.

A defendant is strictly liable for harm caused by an abnormally dangerous activity, defined by whether the activity creates a foreseeable and highly significant risk that cannot be eliminated by reasonable care and is not a matter of common usage. Classic examples include blasting, storing explosives, and handling toxic chemicals. Strict liability extends only to the kind of harm that makes the activity abnormally dangerous, and is unavailable to plaintiffs harmed by an unforeseeable type of injury.

A products-liability claim may proceed under strict liability, negligence, or warranty theories. Manufacturing defects exist when a product departs from its intended design and are judged by a consumer-expectations test. Design defects require proof of a reasonable alternative design under the risk-utility test in most jurisdictions. Warning defects arise from a failure to provide adequate instructions or warnings about non-obvious risks.

Strict products liability requires a commercial seller in the business of selling the product, a defect existing when the product left the defendant's control, and that the defect caused harm while the product was used in a foreseeable manner; privity is not required. All commercial sellers in the distribution chain (manufacturer, distributor, retailer) may be liable. Defenses include comparative fault, product misuse that is unforeseeable, and assumption of risk, but ordinary contributory negligence based on failure to discover the defect is not a defense.

Private nuisance is a substantial & unreasonable interference with another's use and enjoyment of land, judged by the sensibilities of an average person rather than a hypersensitive plaintiff. Public nuisance is an unreasonable interference with a right common to the general public, and a private plaintiff may sue only upon showing a special harm different in kind from that suffered by the public. Remedies include damages and, where damages are inadequate, injunctive relief balanced against the social utility of the conduct.

Defamation requires a defamatory statement of or concerning the plaintiff, publication to a third party, fault, and damage to reputation. Libel (written or permanent form) generally permits presumed damages without proof of special harm, while slander (spoken) requires proof of special (pecuniary) damages unless it falls within slander per se. The statement must be a false assertion of fact, not opinion, and must be reasonably understood as referring to the plaintiff.

Slander per se dispenses with proof of special damages where the statement imputes a serious crime, a loathsome disease, conduct incompatible with the plaintiff's business or profession, or serious sexual misconduct. When the plaintiff is a public official or public figure, the First Amendment requires proof of actual malice (knowledge of falsity or reckless disregard for the truth). A private plaintiff on a matter of public concern need only prove negligence to recover actual damages, but must show actual malice to obtain presumed or punitive damages.

Absolute privileges bar liability regardless of malice and apply to statements made in judicial proceedings, legislative debate, between spouses, and required broadcasts. Qualified (conditional) privileges protect statements made in the speaker's or recipient's legitimate interest, such as employment references and reports to authorities, but are lost if abused through actual malice, excessive publication, or statements outside the privilege's scope. The defendant bears the burden of establishing a privilege.

Privacy comprises four distinct torts: appropriation of the plaintiff's name or likeness for commercial advantage; intrusion upon seclusion that would be highly offensive to a reasonable person; publication of private facts not of legitimate public concern; and false light, attributing to the plaintiff views or actions placing them before the public in a misleading and highly offensive way. False light and disclosure require publicity (widespread dissemination), and truth is not a defense to disclosure though newsworthiness is.

Intentional misrepresentation (fraud) requires a false material representation, scienter (knowledge of falsity), intent to induce reliance, justifiable reliance, and pecuniary damages. Negligent misrepresentation applies chiefly in commercial settings where the defendant carelessly supplies false information for the guidance of a limited group, and liability extends only to foreseeable plaintiffs who justifiably rely. Reliance on a mere opinion or prediction is generally not justifiable unless the speaker has superior knowledge.

Interference with contract or prospective advantage requires a valid contract or business expectancy known to the defendant, intentional improper interference inducing breach or termination, and resulting damages; persuasion by a competitor using lawful means may be privileged. Malicious prosecution requires institution of criminal or civil proceedings without probable cause, for an improper purpose, that terminate in the plaintiff's favor and cause damages. Abuse of process requires the use of legal process for an ulterior purpose plus a willful act misusing that process.

Under respondeat superior, an employer is vicariously liable for torts an employee commits within the scope of employment, including minor deviations (detours) but not substantial departures (frolics). Intentional torts are usually outside the scope unless force is inherent in the work or done to serve the employer. A hiring party is generally not liable for the torts of an independent contractor, except for non-delegable duties and inherently dangerous activities.

Under joint & several liability, each tortfeasor whose conduct is a cause of an indivisible injury is liable for the entire harm, allowing the plaintiff to collect the full amount from any one defendant. Contribution allows a defendant who pays more than its share to recover the excess from other tortfeasors, typically apportioned by comparative fault. Indemnity shifts the entire loss to another, as where a vicariously liable party recovers from the active tortfeasor or a retailer recovers from a manufacturer.

An agency relationship arises when a principal manifests assent that an agent shall act on the principal's behalf and subject to the principal's control, and the agent consents. No consideration is required, and the relationship may be created without a written contract except where the equal-dignities rule applies. Capacity to be a principal requires contractual capacity, while almost anyone with minimal capacity may serve as an agent.

Actual authority is the agent's power to bind the principal based on the principal's manifestations to the agent. Express actual authority arises from the principal's explicit words, while implied actual authority covers acts reasonably necessary to accomplish the authorized task or arising from custom, prior dealings, or the agent's reasonable interpretation of instructions. Actual authority terminates upon revocation, the agent's renunciation, expiration, or, generally, the death or incapacity of the principal.

Apparent authority exists when the principal's manifestations to a third party cause that party to reasonably believe the agent is authorized to act. The key is the principal's holding-out, not the agent's own representations, and it can bind the principal even when actual authority is absent or has been secretly limited. Apparent authority commonly persists after termination of the agency until the third party receives notice, and the third party's reliance must be reasonable.

Ratification binds a principal to an unauthorized act if the principal, with knowledge of the material facts, manifests assent to be bound or accepts the benefits of the transaction. The principal must have existed and had capacity at the time of the act, the ratification relates back to the original transaction, and the principal must ratify the entire act, not just favorable portions. Ratification is ineffective if the third party has withdrawn or circumstances have materially changed.

A principal is liable on contracts an agent makes with actual or apparent authority. Where the principal is disclosed, only the principal is bound and the agent is not personally liable. Where the principal is partially disclosed (unidentified) or undisclosed, both the agent and the principal may be held liable, and the third party may elect remedies; an undisclosed principal is liable only for acts within the agent's actual authority.

A principal is vicariously liable for an agent's torts under respondeat superior when the agent is an employee acting within the scope of employment, the test for which turns on the principal's right to control the manner of work. A principal is generally not liable for the torts of an independent contractor, except for non-delegable duties, inherently dangerous activities, or where apparent agency exists. Intentional torts fall within scope only when motivated to serve the principal or where force is foreseeable in the work.

An agent owes the principal fiduciary duties of loyalty, care, and obedience, including duties to avoid conflicts of interest, not to compete or usurp opportunities, to account for profits, and to follow lawful instructions. A principal owes the agent duties to compensate, reimburse expenses, and cooperate, and may be liable for breach of contract. Breach of the duty of loyalty allows the principal to recover any secret profits and to seek disgorgement.

A general partnership is the association of two or more persons to carry on as co-owners a business for profit, and it may arise by conduct without any formal agreement or filing. The sharing of profits creates a rebuttable presumption of partnership, unless the profits were received as payment of a debt, wages, rent, or interest. Sharing of gross returns or joint property ownership alone does not establish a partnership.

Property is partnership property if acquired in the partnership's name or with partnership funds, and a partner has no transferable interest in specific partnership assets. A partner's transferable interest is limited to the partner's share of profits & distributions, which may be assigned without making the assignee a partner. A creditor of an individual partner may reach that partner's economic interest only through a charging order.

Each partner is an agent of the partnership for the purpose of its business, and an act for apparently carrying on in the ordinary course of partnership business binds the partnership unless the partner lacked authority and the third party knew of the limitation. Acts outside the ordinary course bind the partnership only with actual authority. A partnership may file a statement of partnership authority to grant or limit a partner's authority, especially regarding real property.

Partners are jointly & severally liable for all obligations of the partnership, whether arising in contract or tort. A plaintiff must generally exhaust partnership assets before reaching an individual partner's personal assets. An incoming partner is not personally liable for obligations that arose before joining (liability is limited to the partner's capital contribution), while a dissociating partner may remain liable for pre-dissociation obligations and for post-dissociation acts until proper notice is given.

Partners owe the partnership and one another fiduciary duties of loyalty & care. The duty of loyalty requires accounting for partnership profits and opportunities, refraining from self-dealing adverse to the partnership, and not competing with the partnership. The duty of care requires refraining from grossly negligent or reckless conduct and intentional misconduct, and partners must discharge their duties consistent with the obligation of good faith & fair dealing.

Absent agreement, partners share profits equally regardless of capital contribution, and losses follow profits. Each partner has equal rights in management, with ordinary-course decisions resolved by a majority vote and extraordinary matters requiring unanimous consent. A partner is not entitled to remuneration for services to the partnership except reasonable compensation for winding up, and is entitled to indemnification for liabilities reasonably incurred.

Dissociation is a partner's withdrawal from the partnership, which under RUPA does not necessarily cause dissolution; the partnership may continue and buy out the dissociated partner's interest. Dissolution triggers winding up, during which assets are liquidated and applied first to creditors (including partner-creditors), then to repay capital contributions, with any surplus distributed as profits. A wrongful dissociation makes the partner liable for resulting damages.

A limited partnership requires at least one general partner with management authority and personal liability, and one or more limited partners whose liability is limited to their capital contributions. Formation requires filing a certificate of limited partnership with the state. Under modern statutes, a limited partner does not lose limited liability by participating in management, abolishing the older control rule.

A limited liability partnership is a general partnership that files a statement of qualification to obtain LLP status. In an LLP, partners are not personally liable for the partnership's obligations, whether arising in contract or tort, beyond their investment. A partner remains personally liable for the partner's own wrongful conduct and for those the partner directly supervises, and the LLP must maintain the statutory name designation and any required filings.

A limited liability company is formed by filing articles of organization with the state and is owned by members who enjoy limited liability for the entity's debts. The LLC combines the limited liability of a corporation with the pass-through taxation of a partnership. An operating agreement governs the internal affairs of the LLC and may override most default statutory rules.

An LLC is member-managed by default, with each member having authority to bind the LLC in the ordinary course; the operating agreement may instead designate manager-management, in which managers run the business and non-manager members lack agency authority. Those with management authority owe fiduciary duties of loyalty & care to the LLC. Members ordinarily share profits and have voting rights as provided by statute or the operating agreement, and dissociation does not automatically dissolve the LLC.

A promoter who enters a contract on behalf of a corporation not yet formed is personally liable on that contract, and remains liable even after incorporation unless there is a novation releasing the promoter. The corporation becomes liable only if it adopts the contract expressly or by accepting its benefits. Promoters owe fiduciary duties of good faith to one another and to the corporation, and may not make secret profits at the corporation's expense.

A de jure corporation is formed by full compliance with the incorporation statute, shielding shareholders from personal liability. A de facto corporation arises where there was a good-faith but defective attempt to incorporate under a valid statute and an exercise of corporate privileges, protecting those unaware of the defect. Corporation by estoppel prevents a party who dealt with the business as a corporation from later denying its corporate existence to impose personal liability.

Articles of incorporation are filed with the state and must include the corporate name, number of authorized shares, registered agent, and incorporators; they serve as the corporation's governing charter. Bylaws are internal rules adopted by the incorporators or board and may be amended by the board or shareholders. Under modern ultra vires doctrine, a corporation's act beyond its stated purpose is generally enforceable, and the defense is limited to shareholder suits to enjoin, suits against directors, and state action.

Shares are issued for consideration determined by the board, and under the MBCA any tangible or intangible benefit, including services already performed and promissory notes, is valid consideration. Where shares have a par value, they may not be issued for less than par (issuing below par creates watered stock liability), but most modern statutes have abolished par-value requirements. The board's good-faith determination of the adequacy of consideration is conclusive.

A distribution is a transfer of money or property by the corporation to shareholders, including dividends and stock repurchases, and whether to declare one rests in the board's discretion protected by the business judgment rule. Distributions are prohibited if, afterward, the corporation could not pay its debts as they come due (the equity insolvency test) or its total assets would be less than its total liabilities (the balance-sheet test). Directors who approve an unlawful distribution may be personally liable.

The board acts as a collective body at a duly called meeting with a quorum (a majority of directors unless otherwise specified) or by unanimous written consent; individual directors have no authority to bind the corporation. The business judgment rule presumes directors act on an informed basis, in good faith, and in the honest belief the action serves the corporation's best interests. The rule shields directors from liability for honest, informed decisions that turn out poorly.

A director owes a duty of care to act in good faith with the care an ordinarily prudent person would exercise in a like position and similar circumstances. The director must make reasonably informed decisions and may rely in good faith on reports and information from officers, employees, and experts. Liability for a breach generally requires gross negligence in the decision-making process, and the corporation may limit monetary liability for duty-of-care breaches by charter provision.

The duty of loyalty prohibits directors from advancing personal interests at the corporation's expense. A conflicting-interest (self-dealing) transaction is not voidable solely for the conflict if it was approved after disclosure by disinterested directors or disinterested shareholders, or if the transaction was fair to the corporation. The business judgment rule does not protect conflicted transactions; the director bears the burden of showing fairness when no cleansing vote occurred.

Under the corporate opportunity doctrine, a director or officer may not divert to personal use a business opportunity in which the corporation has an interest or expectancy or that is closely related to its business, without first offering it to the corporation. Remedies include disgorgement or a constructive trust. A corporation must indemnify a director who prevails on the merits, may indemnify one who acted in good faith and in the corporation's best interests, and may not indemnify a director found liable to the corporation absent court approval.

Shareholders of record on the record date may vote at meetings, in person or by proxy, and elect directors typically by plurality, though cumulative voting may be authorized to aid minority representation. A proxy is revocable unless coupled with an interest and stated to be irrevocable. Shareholders may bind their voting through voting agreements or voting trusts, and unanimous shareholder agreements may dispense with many corporate formalities.

A derivative suit enforces the corporation's own right against wrongdoers, with any recovery going to the corporation, whereas a direct suit vindicates the shareholder's personal rights. A derivative plaintiff must have been a contemporaneous shareholder, fairly represent the corporation's interests, and make a written demand on the board (which must wait 90 days under the MBCA unless excused by irreparable harm). The board may move to dismiss upon a good-faith determination by independent directors that the suit is not in the corporation's best interests.

A shareholder has a statutory right to inspect corporate books and records upon a proper purpose reasonably related to the shareholder's interest, with written notice. A controlling shareholder owes fiduciary duties to the corporation and to minority shareholders, particularly in transactions such as the sale of control, freeze-outs, or self-dealing, and must not use control to obtain benefits at the minority's expense. In close corporations, courts often impose heightened duties of good faith among shareholders akin to those among partners.

Courts disregard the corporate entity to hold shareholders personally liable where the corporate form is abused to work an injustice or fraud. Common grounds include undercapitalization, failure to observe corporate formalities, commingling of personal and corporate assets, and using the corporation as a mere alter ego or instrumentality. Veil-piercing is applied more readily in tort cases than contract cases and almost never against passive investors in publicly held corporations.

Fundamental changes such as mergers, sales of substantially all assets outside the ordinary course, and dissolution require board approval followed by shareholder approval (a majority of outstanding shares under the MBCA). A short-form merger of a 90%-owned subsidiary into its parent requires no vote of the subsidiary's shareholders. A purchaser of assets generally does not assume the seller's liabilities absent an agreement, de facto merger, mere continuation, or fraud.

Appraisal (dissenters') rights entitle a shareholder who objects to certain fundamental changes (such as a merger or sale of substantially all assets) to compel the corporation to buy the shares at fair value determined by a court if necessary. The shareholder must follow procedural steps, including filing a written objection and not voting in favor. Voluntary dissolution requires board and shareholder approval, while involuntary dissolution may be ordered for director deadlock, oppression of minority shareholders, or waste.

Rule 10b-5 prohibits fraud or material misrepresentations and omissions in connection with the purchase or sale of any security. A private plaintiff must prove a material misstatement or omission, scienter (intent to deceive or recklessness), reliance, in-connection-with a securities transaction, causation, and damages. The rule also reaches insider trading, where an insider trades on or tips material nonpublic information in breach of a fiduciary duty.

Section 16(b) requires directors, officers, and 10%-or-greater shareholders of a reporting company to disgorge to the corporation any profit from a purchase & sale (or sale & purchase) of the company's equity securities within a six-month period. Liability is strict, requiring no proof of actual use of inside information or bad intent. The profit is computed by matching the highest sale price against the lowest purchase price within any six-month window to maximize recoverable profit.

Article 9 governs any transaction, regardless of its form, that creates a security interest in personal property or fixtures by contract. It also reaches agricultural liens, sales of accounts, chattel paper, payment intangibles, and promissory notes, and consignments. Substance controls over labels, so a transaction styled as a lease may be treated as a disguised security interest if its economics make it one.

A security interest is an interest in personal property or fixtures that secures payment or performance of an obligation. The party holding it is the secured party, the party owing the obligation is the debtor, and the property subject to the interest is the collateral. A lease creates a security interest rather than a true lease when the lessee cannot terminate and the term covers the goods' entire economic life or includes a nominal-price purchase option.

Goods are classified by the debtor's primary use at the time the security interest attaches. Consumer goods are used for personal, family, or household purposes; inventory is held for sale or lease or consumed in a business; farm products are crops or livestock in a farming operation held by the farmer; and equipment is the catch-all for goods that fit no other category. Classification matters because perfection and priority rules differ by collateral type.

Instruments are negotiable instruments or writings evidencing a right to payment; chattel paper evidences both a monetary obligation & a security interest in or lease of specific goods; accounts are rights to payment for goods sold or services rendered not in an instrument. General intangibles are the residual category covering personal property like software, patents, and goodwill, and a payment intangible is a general intangible under which the principal obligation is monetary.

A deposit account is a demand, time, savings, or similar account at a bank, and as original collateral it can be perfected only by control. Investment property includes securities, securities accounts, and commodity contracts. Article 9 does not cover deposit accounts taken as original collateral in a consumer transaction, but it does reach them as proceeds.

A security interest attaches, becoming enforceable against the debtor, only when three things coexist: value has been given by the secured party, the debtor has rights in the collateral or power to transfer rights, and the debtor has authenticated a security agreement describing the collateral, or the secured party has possession or control under the agreement. Attachment occurs the moment the last of these elements is satisfied unless the parties agree to postpone it.

An authenticated security agreement must reasonably describe the collateral so it is objectively identifiable; a description by category or Article 9 type generally suffices. A supergeneric description such as all the debtor's assets or all personal property is insufficient in a security agreement, even though it is permitted in a financing statement. Value can be a present advance, a binding commitment, or antecedent debt.

A security interest may reach collateral the debtor acquires later only if the security agreement contains an after-acquired property clause. Such a clause is generally read into agreements covering inventory and accounts because of their revolving nature. However, an after-acquired clause does not reach consumer goods the debtor acquires more than ten days after the secured party gives value, and it does not reach commercial tort claims.

A security agreement may secure future advances or other value whether or not the advances are given pursuant to commitment. A dragnet clause allows the same collateral to secure later loans without a new security agreement. This lets one filing cover an evolving line of credit, and the priority date for such advances generally relates back to the original filing or perfection.

Perfection requires that the security interest first attach and that the secured party take an appropriate perfecting step, most commonly filing a financing statement, taking possession, taking control, or relying on automatic perfection. Perfection establishes the secured party's priority against most third parties such as other creditors and a trustee in bankruptcy. The method available depends on the collateral type.

A valid financing statement must provide the debtor's name, the secured party's name, and an indication of the collateral; a supergeneric indication like all assets is permissible here. The debtor's name must be correct, and a seriously misleading error in the name is fatal unless a standard search under the correct name would still disclose it. Filing is done centrally in the state where the debtor is located, which for a registered organization is its state of organization.

A security interest in money can be perfected only by possession, and possession also perfects interests in goods, instruments, negotiable documents, and tangible chattel paper. Control is the required or preferred method for deposit accounts, investment property, electronic chattel paper, and letter-of-credit rights. A secured party obtains control of a deposit account by being the depositary bank, becoming the account customer, or entering a control agreement with the bank.

A purchase-money security interest in consumer goods is perfected automatically upon attachment, with no filing or possession required. A PMSI arises when the secured party either sells the goods on credit or advances funds used to acquire them and takes a security interest in those very goods. This automatic perfection does not protect against a bona fide consumer buyer under the consumer-to-consumer (garage sale) exception unless the secured party has filed.

A security interest in proceeds is automatically perfected for twenty days after the debtor receives them if the interest in the original collateral was perfected. Beyond twenty days, proceeds perfection continues only if the same-office and traceable-cash rules are met, the proceeds are of a type covered by the original filing in the same office, or the secured party perfects the proceeds separately. There are also short temporary-perfection windows for instruments and negotiable documents made available to the debtor.

Between two perfected security interests in the same collateral, priority goes to the first to file or perfect, whichever occurs earlier, measured continuously without a gap. A perfected security interest always defeats an unperfected one, and between two unperfected interests the first to attach prevails. This first-to-file-or-perfect rule rewards prompt public filing even before the loan is actually funded.

A PMSI in goods other than inventory or livestock takes priority over conflicting earlier-filed security interests, including after-acquired property interests, if it is perfected within twenty days after the debtor receives possession of the collateral. This grace period lets a financier of new equipment leapfrog a prior all-assets lender. No advance notice is required for non-inventory equipment.

A PMSI in inventory achieves superpriority only if the secured party perfects before the debtor receives the inventory and sends an authenticated notice to earlier conflicting secured parties of record, who must receive it within five years before the debtor takes possession. The stricter rule exists because inventory financers expect to advance against incoming goods. The notice must state that the holder expects to acquire a PMSI in the debtor's inventory and describe it.

A buyer in ordinary course of business takes free of a security interest created by the buyer's seller, even if perfected and even if the buyer knows it exists, so long as the buyer does not know the sale violates the secured party's rights. The buyer must buy in good faith, without knowledge of the violation, and from a person in the business of selling goods of that kind. This rule protects ordinary retail purchases of inventory.

A buyer who is not in ordinary course generally takes subject to a perfected security interest but takes free of an unperfected one if the buyer gives value and receives delivery without knowledge of it. Under the consumer-to-consumer exception, a buyer of consumer goods who buys for value, for personal use, and without knowledge takes free of a PMSI perfected only automatically, unless the secured party had filed before the purchase.

A lien creditor, including a bankruptcy trustee with hypothetical lien-creditor status, takes priority over a security interest that is unperfected when the lien arises. A perfected secured party generally beats a lien creditor, and a PMSI that is perfected within its twenty-day grace period after the lien attaches relates back to defeat the intervening lien. Future advances made within forty-five days of the lien, or without knowledge of it, also retain priority.

A security interest in fixtures can be perfected by a regular filing or by a fixture filing in the real-property records. A PMSI in fixtures has priority over a prior recorded real-estate interest such as a mortgage if a fixture filing is made before or within twenty days after the goods become fixtures. Absent that PMSI priority, the first-in-time recording rule between the fixture security interest and the real-estate encumbrance generally governs.

A security interest automatically continues in any identifiable proceeds of the collateral, meaning whatever the debtor receives on its sale, lease, exchange, or other disposition. Proceeds may be cash or noncash, and the secured party may trace commingled cash proceeds in a bank account using the lowest intermediate balance rule. Because proceeds attachment is automatic, no separate after-acquired clause is needed to reach them.

On default, a secured party may take possession of the collateral, by self-help without judicial process if it can be done without a breach of the peace, or otherwise through a judicial action like replevin. A breach of the peace occurs with conduct risking violence, such as entering a closed garage or repossessing over the debtor's express objection. A self-help repossession that breaches the peace exposes the secured party to liability and loss of certain protections.

After repossession the secured party may sell, lease, or otherwise dispose of the collateral, but every aspect of the disposition, including method, manner, time, place, and terms, must be commercially reasonable. The sale may be public or private and discharges the security interest and subordinate interests, transferring the debtor's rights to a good-faith transferee. A low price alone does not prove unreasonableness but invites scrutiny of the procedures used.

The secured party must send reasonable authenticated notice of the disposition to the debtor, secondary obligors, and, in non-consumer cases, other secured parties who have given notice or are of record. In a non-consumer transaction, notice sent at least ten days before disposition is reasonable as a safe harbor. Consumer-goods notices must include additional statutory content, and failure to give proper notice can reduce or bar a deficiency.

Disposition proceeds are applied first to the expenses of repossession and sale, then to the secured obligation, then to subordinate interests; any remaining surplus goes to the debtor, who remains liable for any deficiency. In a non-consumer case, if the secured party fails to comply with Article 9, the rebuttable presumption rule presumes the proceeds equaled the debt unless the secured party proves a smaller shortfall. Surplus and deficiency in consumer transactions may turn on absolute-bar or set-off approaches that vary by jurisdiction.

Before the secured party disposes of the collateral, collects on it, or accepts it in satisfaction, the debtor or other secured party may redeem by tendering full payment of the obligation plus reasonable expenses. If the obligation has been accelerated, redemption requires paying the entire accelerated balance, not just missed installments. The right to redeem terminates once the collateral is disposed of or accepted.

Instead of selling, a secured party may propose to accept the collateral in full or partial satisfaction of the debt, a remedy called strict foreclosure. This requires the debtor's consent and the absence of objection from other interested parties within the statutory period; partial strict foreclosure is not allowed in consumer transactions. Mandatory disposition is required in consumer-goods cases where the debtor has paid at least sixty percent of the price or obligation, forcing a sale within ninety days unless the debtor waives.

An accession is a good physically united with other goods such that its identity is not lost, like a new engine installed in a vehicle. A security interest in a good continues even after it becomes an accession, and perfection in the accession is governed by ordinary Article 9 rules. A security interest perfected when the good becomes an accession generally has the priority it otherwise would, but a security interest in the whole that is perfected by a certificate-of-title notation can prevail over an interest in the accession.

A security interest in a deposit account perfected by control defeats one perfected by any other method, and a secured party that is the depositary bank itself has priority over a secured party that controls via a control agreement. For investment property, control likewise beats filing, and a securities intermediary or broker generally has priority in property it controls. These control-trumps-filing rules reflect the need for certainty in payment and financial-asset systems.

A person acquires a domicile of choice by being physically present in a place coupled with the intent to remain there indefinitely, with no present intention of leaving. A person can have only one domicile at a time, and an existing domicile continues until a new one is established by satisfying both the presence and intent elements. Motive for the move is irrelevant so long as the requisite intent to make the place home is present.

Some persons receive a domicile by operation of law rather than by choice. A child's domicile is generally that of the parent with whom the child lives (a domicile of origin at birth), and a person who lacks legal capacity, such as one adjudged incompetent, typically retains the last domicile held while competent or takes that of a guardian. Modern law generally allows each spouse to have an independent domicile rather than imposing the husband's domicile on the wife.

A court may exercise personal jurisdiction consistent with due process only if the defendant has minimum contacts with the forum such that suit does not offend traditional notions of fair play and substantial justice. General jurisdiction lies where the defendant is essentially at home, while specific jurisdiction requires that the claim arise from or relate to the defendant's purposeful contacts with the forum. These limits cabin a forum's power even before any choice-of-law question is reached.

The traditional vested rights approach of the First Restatement applies the law of the place where the last event creating the legal right occurred. For torts this means lex loci delicti, the law of the place of the injury; for contracts it generally means lex loci contractus, the place of contracting for validity, and the place of performance for performance issues. The method prizes predictability and uniformity but is criticized for producing arbitrary results detached from the parties' real connections.

The Second Restatement, the modern majority approach, applies the law of the state with the most significant relationship to the issue, evaluated through general policy factors and issue-specific connecting factors. The general factors include the relevant policies of the forum and other interested states, the needs of the interstate system, predictability, and the protection of justified expectations. Courts identify the contacts most relevant to the particular issue and weigh them qualitatively rather than simply counting them.

Under governmental interest analysis, a court examines each state's law to determine whether that state has a genuine interest in applying its policy to the dispute. A false conflict exists when only one state has a real interest, and that state's law applies; a true conflict exists when more than one does. In a true conflict the forum generally applies its own law, and an unprovided-for case arises when no state has an interest, often leading to forum law as well.

Under Leflar's choice-influencing considerations, a court weighs predictability, maintenance of interstate order, simplification of the judicial task, advancement of the forum's governmental interests, and application of the better rule of law. Comparative impairment, used in true conflicts, applies the law of the state whose policy would be more impaired if its law were not applied, rather than simply preferring the forum. Both are minority refinements responding to perceived weaknesses in pure interest analysis.

Traditionally, tort claims were governed by lex loci delicti, the place of the injury. Under the modern Second Restatement, courts apply the law of the state with the most significant relationship, weighing contacts such as the place of injury, the place of the conduct causing it, the parties' domiciles, and where their relationship is centered. For issues like loss-allocation between parties of a common domicile, that shared-domicile state's law frequently governs.

Parties generally enjoy party autonomy to choose the governing law in a valid choice-of-law clause, which courts honor if the chosen state has a substantial relationship to the deal or another reasonable basis exists, and applying it would not violate a fundamental policy of a more interested state. Absent a valid choice, the Second Restatement applies the most significant relationship, considering place of contracting, negotiation, performance, subject-matter location, and the parties' domiciles. The First Restatement instead used the place of contracting for validity and the place of performance for performance.

Questions concerning interests in real property are governed by the law of the situs, the state where the land is located, a rule followed under both the traditional and modern approaches. For personal property, an inter vivos transfer's validity is generally governed by the law of the situs of the property at the time of the transaction. The strong situs rule for land reflects each state's dominant interest in real property within its borders.

A marriage valid where celebrated is generally valid everywhere under the place-of-celebration rule. An exception allows a state to refuse recognition where the marriage violates a strong public policy of the state with the most significant relationship to the spouses, such as incest or, historically, polygamy. The legitimacy and status of a child are commonly determined by the law of the state with the most significant relationship to the child and parents.

Under the internal affairs doctrine, the law of the state of incorporation governs the internal relationships of the corporation, such as the duties of directors and officers, shareholder rights, and voting. This rule provides certainty by ensuring that one body of law governs the entity's internal governance regardless of where it operates. Matters external to internal governance, like a corporation's torts or contracts, are resolved under ordinary choice-of-law rules.

The validity and effect of a will disposing of real property are governed by the law of the situs, while succession to personal property, including intestate distribution and will interpretation, is governed by the law of the decedent's domicile at death. Many states also have validating statutes upholding a will valid under the law of the place of execution or the testator's domicile. The situs/domicile divide mirrors the broader real-versus-personal property distinction.

The forum always applies its own procedural law while applying the chosen state's substantive law to the merits. The traditional characterization treats matters affecting the conduct of litigation, such as rules of evidence and the form of action, as procedural. Because the line can be outcome-determinative, modern courts increasingly classify rules functionally rather than by label, especially for statutes of limitations and damages.

Traditionally a statute of limitations was treated as procedural, so the forum applied its own limitations period regardless of which state's substantive law governed. A common exception was the borrowing statute, by which the forum borrowed a shorter foreign period to bar stale claims. Under the modern Second Restatement approach, the forum generally applies its own limitations period only if doing so would not frustrate the policies of the state whose law governs the claim, and otherwise applies the limitation of the state with the more significant relationship.

Burden of proof and presumptions are often characterized as procedural and governed by forum law, though presumptions that reflect a substantive policy may be treated as substantive. Damages, including the measure of recovery and the availability of punitive damages, are substantive and governed by the law selected under the applicable choice-of-law approach. A statutory damages cap is therefore generally substantive, so the governing state's cap controls rather than the forum's.

A forum may refuse to apply otherwise-governing foreign law when doing so would violate a strong public policy of the forum, but this exception is narrow and a mere difference between the laws is not enough. The foreign law must be sufficiently repugnant to the forum's deeply rooted sense of justice. When the public-policy exception applies, the forum typically dismisses the claim or applies its own law instead.

Characterization is the process of classifying an issue, such as labeling a question tort or contract, substantive or procedural, which can be outcome-determinative and is performed under forum law. Depecage is the practice of applying the law of different states to different issues within a single case, so that, for example, one state's law governs liability while another's governs damages. Both devices give courts flexibility to reach results the rigid traditional rules might otherwise prevent.

Renvoi arises when the forum's choice-of-law rule points to another state and asks whether that reference includes the other state's conflicts rules or only its internal law. Most courts apply only the foreign state's internal law and reject renvoi to avoid endless circularity. Renvoi is sometimes accepted in limited areas like title to land and validity of divorce, where the forum wants to decide as the situs or domicile court would.

For a state's law to be constitutionally applied consistent with Due Process and Full Faith and Credit, that state must have a significant contact or aggregation of contacts creating state interests, so that applying its law is neither arbitrary nor fundamentally unfair. These clauses set only an outer boundary, and several states may each have enough contacts to apply their own law to the same dispute. The forum may not, however, apply its own law where it has no real connection to the parties or occurrence.

Under Full Faith and Credit, a final, valid judgment on the merits rendered by a sister-state court must be recognized and enforced by other states. The rendering court must have had proper jurisdiction over the parties and subject matter, the judgment must be final, and it must be on the merits. The enforcing state may not reexamine the merits, even if it believes the rendering court erred on the law or facts.

A sister-state judgment may be denied recognition only on narrow grounds, principally a lack of jurisdiction in the rendering court or that the judgment was obtained by extrinsic fraud. A party that appeared and litigated jurisdiction, or had a full opportunity to do so, is generally barred from relitigating it. Notably, the public policy of the enforcing state is not a valid defense to enforcing a sister-state judgment, even though it may bar applying sister-state law.

Recognition of a foreign-country judgment rests on principles of comity rather than constitutional command, and is widely governed by uniform recognition acts. Courts generally recognize a foreign money judgment if the foreign court had jurisdiction and used procedures compatible with due process and impartial tribunals. Unlike sister-state judgments, recognition may be refused on grounds such as repugnance to public policy or lack of a fair, impartial proceeding.

A state need not enforce another state's penal judgment, meaning a judgment punishing an offense against the public, though a private tort judgment is enforceable even if labeled punitive. Divorce decrees are entitled to full faith and credit if the rendering state was the domicile of at least one spouse and had jurisdiction. Custody and support decrees, which can be modifiable, are governed by uniform acts that channel jurisdiction and limit modification by other states.

Under the Erie doctrine, a federal court sitting in diversity applies federal procedural law but the substantive law of the state in which it sits, including that state's common law. The Klaxon rule requires the federal court to apply the choice-of-law rules of the forum state, so the federal court reaches the same governing law a state court in that forum would. This prevents forum-shopping between state and federal courts in the same state and preserves the substantive outcome.

Whether a plaintiff may bring a direct action against an insurer, and the existence and scope of survival and wrongful death claims, are treated as substantive and governed by the applicable choice-of-law rule rather than forum procedure. The traditional approach looked to the place of the wrong, while the modern approach applies the most-significant-relationship state's law. Distinguishing these substantive rights from procedural mechanics is essential because the characterization dictates which state's law supplies the cause of action.

A valid ceremonial marriage requires legal capacity (both parties unmarried, of sufficient age, not within prohibited degrees of kinship, and mentally competent to consent), mutual present consent to marry, and compliance with state license & ceremony formalities. Validity is generally governed by the law of the place of celebration, so a marriage valid where contracted is recognized elsewhere unless it violates a strong public policy of the forum.

Most states require the parties to obtain a marriage license and to solemnize the union before an authorized officiant in the presence of witnesses. Statutory formalities such as the license, waiting period, and ceremony are usually treated as directory rather than mandatory, so technical defects do not void an otherwise valid marriage where the parties acted in good faith.

In the minority of states that still recognize it, a common-law marriage is formed when capable parties (1) presently agree to be married, (2) cohabit, and (3) hold themselves out publicly as spouses. No license or ceremony is required, and a common-law marriage validly formed in one state must be recognized by other states under full faith and credit and comity principles.

A putative spouse is one who participated in a marriage ceremony with a good-faith belief that the marriage was valid, when in fact it was void or voidable. The putative spouse may obtain equitable relief such as property division and support that would be available to a lawful spouse, with rights continuing until he or she learns of the impediment.

A void marriage is invalid from inception and may be challenged by anyone at any time, even after death; grounds include bigamy and incest. A voidable marriage is valid until annulled at the request of the injured party; grounds include nonage, impotence, fraud going to the essentials, and duress. An annulment treats the marriage as never having existed, though courts may still award support and divide property.

Under the Uniform Premarital Agreement Act, a premarital agreement must be in a signed writing and is enforceable without consideration. It is unenforceable if a party proves it was not voluntary (e.g., duress) or was unconscionable when executed and that party lacked fair disclosure of assets, did not waive disclosure, and had no adequate knowledge of the other's finances. Provisions that adversely affect child support are not binding on the court.

Marriage creates reciprocal rights and duties including the obligation of mutual support, and confers benefits such as the spousal testimonial & confidential communications privileges, intestate inheritance, and the elective share. Under modern law these rights are gender-neutral, and the state generally will not adjudicate the day-to-day allocation of duties within an intact marriage.

During an intact marriage, each spouse in a separate-property (common-law) state owns and controls the property titled in his or her own name, while in a community-property state each spouse owns an undivided one-half interest in property acquired through either spouse's labor during marriage. Property characterization fixed during marriage governs how assets are later divided at divorce or death.

Under the doctrine of necessaries, a spouse may be held liable to third parties for the reasonable cost of necessary goods and services (such as food, shelter, and medical care) furnished to the other spouse. Modern courts apply the doctrine in a gender-neutral manner, often making the receiving spouse primarily liable and the other spouse secondarily liable.

Every state permits no-fault divorce based on irreconcilable differences or an irretrievable breakdown of the marriage, sometimes requiring a period of living separate and apart. Many states also retain traditional fault grounds such as adultery, cruelty, desertion, and habitual drunkenness, which can remain relevant to support or property division in some jurisdictions.

Traditional defenses to fault-based divorce include recrimination (both spouses at fault), connivance (consent to the misconduct), condonation (forgiveness and resumption of relations), and collusion (fabricated grounds). These defenses have largely disappeared in the no-fault era because a unilateral assertion of irreconcilable differences cannot effectively be contested.

A legal separation (divorce from bed and board) allows a court to order support and resolve custody and property issues while the parties remain legally married. Unlike a divorce, it does not dissolve the marital status and therefore does not permit either party to remarry, and it may later be converted into an absolute divorce.

Marital property generally includes all assets acquired by either spouse during the marriage regardless of title, while separate property includes assets owned before marriage and those received during marriage by gift, bequest, devise, or inheritance. Separate property may be transmuted into marital property by commingling, and its appreciation may become marital if attributable to marital effort.

In equitable-distribution states, a court divides marital property in a manner that is fair but not necessarily equal, considering factors such as the length of the marriage, each spouse's contributions (including homemaking), age, health, earning capacity, and economic circumstances. Marital fault is generally not considered, though economic misconduct such as dissipation of assets may be weighed.

In community-property states, property acquired by either spouse's earnings during marriage is owned equally and is typically divided 50/50 at divorce, while property acquired before marriage or by gift or inheritance remains separate. Some community-property states divide property equitably rather than equally, but the underlying characterization of assets remains central.

The majority rule treats a professional degree or license as not marital property because its value is too speculative, though the supporting spouse may receive reimbursement or an offsetting award. Courts are split on enterprise (business) goodwill versus personal goodwill, with many distributing enterprise goodwill as a marital asset but excluding goodwill tied solely to a spouse's personal reputation.

Just as assets are divided, marital debts incurred during the marriage for the benefit of the family are subject to equitable allocation between the spouses. A court allocation of debt binds only the spouses as between themselves; a creditor may still pursue whichever spouse is contractually liable, so the burdened spouse's remedy is contribution or indemnification.

Permanent (or durational) support provides ongoing maintenance, typically after a long marriage where one spouse cannot become self-sufficient. Rehabilitative support is time-limited to allow a spouse to gain education or training toward self-support, while reimbursement support compensates a spouse who supported the other through schooling or career advancement. Lump-sum support is a fixed, non-modifiable award.

In setting alimony a court considers the financial needs and resources of each spouse, the standard of living established during the marriage, the marriage's duration, each spouse's earning capacity and contributions (including homemaking), and the age and health of the parties. The award aims to address economic disparity rather than to punish marital misconduct.

Modifiable spousal support may be changed upon a substantial & continuing change in circumstances, such as a significant change in either party's income or needs. Support generally terminates automatically upon the death of either party or the remarriage of the recipient, and many states permit termination or suspension when the recipient cohabits with a romantic partner.

Custody is determined by the best interests of the child standard, under which the court weighs factors such as the child's relationship with each parent, the parents' ability to provide a stable home, the child's wishes (if of sufficient maturity), each parent's mental and physical health, and the desire to maintain continuity. A natural parent generally prevails over a nonparent absent unfitness or detriment to the child.

Legal custody concerns decision-making authority over major matters like education, religion, and health care, while physical custody concerns where the child resides. Joint custody may be joint legal, joint physical, or both, and many states favor an award that maximizes both parents' involvement where the parents can cooperate and it serves the child's best interests.

A noncustodial parent is ordinarily entitled to reasonable visitation unless it would seriously endanger the child's physical, mental, or emotional health. Visitation may be restricted or supervised where necessary, and under Troxel v. Granville a fit parent's decision regarding third-party (e.g., grandparent) visitation is entitled to special weight.

A custody order may be modified upon a substantial change in circumstances affecting the child's welfare, with the modification serving the child's best interests. When a custodial parent seeks to relocate, courts weigh the reasons for and against the move, the relationship with each parent, and the impact on the child, with the burden allocation varying by jurisdiction.

Under the Uniform Child Custody Jurisdiction & Enforcement Act, initial custody jurisdiction lies in the child's home state, defined as where the child lived with a parent for the six consecutive months before the proceeding. The state that made the initial order retains exclusive continuing jurisdiction, and another state may exercise temporary emergency jurisdiction when a child present in the state is abandoned or endangered.

Child support is set by statutory guidelines that create a rebuttable presumption of the correct amount, with most states using the income-shares model that pools both parents' incomes and apportions support by their respective shares. A court may deviate from the guideline amount upon written findings that application would be unjust or inappropriate given the child's needs.

The duty to support a child ordinarily continues until the child reaches the age of majority or is otherwise emancipated by marriage, military service, or self-sufficiency. Support may extend beyond majority for a child who is still in high school or, in some states, for post-secondary education or an adult disabled child who cannot self-support.

Child support may be modified prospectively upon a substantial & continuing change in circumstances, such as a change in either parent's income or the child's needs. Courts will not retroactively modify accrued arrearages, which become vested judgments, and a parent who voluntarily reduces income in bad faith may have support based on imputed earning capacity.

Child support is enforced through tools such as income withholding, contempt, liens, and license suspension. Under the Uniform Interstate Family Support Act, only one controlling order may exist at a time, and the issuing state retains continuing exclusive jurisdiction to modify support so long as a party or the child remains there; orders are enforced across state lines by registration.

A child born to a married woman is presumed to be the child of her husband, a presumption that historically was nearly conclusive but is now generally rebuttable by clear evidence including genetic testing. The presumption protects marital and family stability, and some courts limit who may rebut it and within what time period to preserve the child's settled parentage.

Paternity may be established by a voluntary acknowledgment of paternity, which has the effect of a judgment and may be rescinded only within a short statutory window (commonly 60 days) or later challenged for fraud, duress, or material mistake. Where parentage is disputed, courts order genetic testing, and a result above the statutory probability threshold creates a presumption of paternity.

A husband or partner who consents to a woman's artificial insemination or assisted reproduction is treated as the legal parent, while a sperm or egg donor who provides genetic material to a licensed provider is generally not a legal parent. Surrogacy arrangements vary widely by state, with some enforcing gestational-carrier agreements and others voiding them on public-policy grounds.

Adoption requires the consent of the child's legal parents, which permanently terminates their parental rights and duties and substitutes the adoptive parents. Consent may be dispensed with where parental rights are involuntarily terminated for abandonment, abuse, neglect, or unfitness, and an unwed biological father's rights are protected only if he has grasped the opportunity to develop a relationship with the child.

Agency adoptions are arranged through licensed agencies, while private (independent) adoptions are arranged directly between the birth and adoptive parents. A stepparent adoption allows a spouse to adopt the other's child, often with streamlined procedures, and an open adoption permits continuing contact with the birth family by agreement; the new parent-child relationship is otherwise treated as if biological.

A court has subject-matter jurisdiction to grant a divorce based on at least one spouse's domicile in the state, satisfying any durational residency requirement. An ex parte (divisible) divorce validly dissolves the marital status where the petitioner is domiciled, but the court cannot adjudicate support or property rights of an absent spouse without personal jurisdiction over that spouse.

A court may issue a protective order to a victim of domestic violence, often beginning with an ex parte temporary order based on an immediate showing of danger, followed by a full hearing for a longer-term order. Such orders can prohibit contact, exclude the abuser from the home, and address temporary custody, and they are entitled to full faith and credit enforcement in other states.

When a decedent dies intestate, the surviving spouse takes a share that varies by jurisdiction; under the UPC the spouse takes the entire estate if all of the decedent's descendants are also descendants of the spouse and the spouse has no other descendants. Any remaining estate passes to the decedent's descendants, who take to the exclusion of ancestors and collaterals.

Under strict per stirpes, the estate is divided into equal shares at the first generation even if no one at that level survives. Under per capita with representation, division begins at the first generation with a living taker, while the modern UPC per capita at each generation approach pools the shares of deceased members at each level and divides them equally among the takers of the next generation so that equally related heirs take equal shares.

If a decedent leaves no surviving spouse or descendants, the estate passes to the decedent's parents, and if none, to the descendants of the parents (siblings and their issue). More remote collateral kin take only when nearer relatives are absent, and if no taker exists the estate escheats to the state.

An advancement is a lifetime gift to an heir intended as a prepayment of that heir's intestate share, which is added back into the estate (hotchpot) and then deducted from the recipient's share. Under the UPC, a lifetime gift is treated as an advancement only if the decedent declared so in a contemporaneous writing or the heir acknowledged it in writing.

Under the Uniform Simultaneous Death Act and the UPC, a person must survive the decedent by 120 hours to take, and a claimant who cannot establish survival by that margin is deemed to have predeceased. This rule applies to intestate succession, wills, and other transfers and prevents property from passing through and being taxed in two estates in quick succession.

An heir or beneficiary may disclaim (renounce) an inheritance by a signed writing, and the disclaimant is treated as having predeceased the decedent so the property passes to the next taker. A valid disclaimer cannot be used to defeat the disclaimant's creditors in many states, and federal tax law requires a qualified disclaimer within nine months to avoid gift-tax consequences.

Under the slayer rule, a person who feloniously & intentionally kills the decedent is barred from inheriting from the victim by will, intestacy, or beneficiary designation, and is treated as having predeceased the victim. A conviction conclusively establishes the disqualification, and even an acquittal does not preclude a finding by the lower preponderance standard in the probate proceeding.

A testator must be of legal age and possess testamentary capacity, meaning the ability to understand the nature & extent of his property, the natural objects of his bounty, the nature of making a will, and how these relate in an orderly plan. The testator must also have present testamentary intent that the instrument operate as a will at death; capacity is judged at the moment of execution.

A valid attested will generally must be (1) in writing, (2) signed by the testator or by another at the testator's direction and in his presence, and (3) signed by at least two witnesses. The witnesses must sign within a reasonable time after witnessing the testator's signing or his acknowledgment of the will, and under the UPC they need not sign in each other's presence.

At common law a gift to an attesting witness could void the witness's competency and the bequest; modern purging statutes instead strike or reduce the interested witness's gift to the amount he would take in intestacy. Under the UPC, an interested witness does not forfeit the bequest at all, and the will remains valid so long as it has the required number of witnesses.

A holographic will is one that is handwritten and signed by the testator but not witnessed, and it is valid in roughly half the states. Under the UPC, only the signature and the material portions of the document must be in the testator's handwriting, allowing the use of preprinted forms so long as the substantive gifts are handwritten.

Under the UPC harmless-error (dispensing power) doctrine, a document not executed with the required formalities may still be probated if the proponent shows by clear & convincing evidence that the decedent intended it to be his will. The related substantial-compliance doctrine excuses minor formal defects where the purposes of the Wills Act are nonetheless satisfied.

Under the doctrine of integration, all sheets of paper that are physically present at execution and intended by the testator to be part of the will are treated as a single integrated document. Physical connection (such as stapling) and an internal coherence of language help establish that the pages were present and intended to be part of the will.

A writing that is not itself executed with will formalities may be incorporated into the will if it was in existence when the will was executed, the will manifests an intent to incorporate it, and the will describes the writing sufficiently to identify it. The UPC separately allows a will to refer to a later list disposing of tangible personal property even if prepared after execution.

Under the doctrine of acts (facts) of independent significance, a will may dispose of property by reference to acts or events that have their own lifetime significance apart from their effect on the will. For example, a gift of the contents of the testator's house or the car he owns at death is valid because the acquisition and use of those items occur for independent, nontestamentary reasons.

A pour-over will devises probate assets to the trustee of a trust established during the testator's life, allowing those assets to be administered under the trust's terms. Under the UTATA, the trust may be amended after the will is executed and may even be unfunded during life, and the pour-over is valid so long as the trust is identified in the will and executed concurrently or before.

A conditional will takes effect only if a stated condition occurs, and if the condition fails the will is given no effect. Courts construe language cautiously and will often treat a reference to a contemplated event (such as a journey) as merely the motive for making the will rather than a true condition, thereby upholding the will.

A testator may revoke a will by a physical act such as burning, tearing, canceling, or obliterating it, performed with the simultaneous intent to revoke. The act may be done by another person at the testator's direction and in his presence; a will traced to the testator's possession but not found at death raises a presumption of revocation.

A will may be revoked by a later validly executed will or codicil that either expressly revokes the prior will or does so by inconsistency. A subsequent will that wholly disposes of the estate is presumed to replace the prior will, while one that only partly disposes of property is presumed to supplement it as a codicil.

Under dependent relative revocation (DRR), a revocation that was premised on a mistaken belief of law or fact will be disregarded if the testator would not have revoked but for that mistake. The doctrine typically applies when a testator revokes an old will believing a new disposition is effective, and the court reinstates the prior will because it is closer to the testator's true intent than intestacy.

Revival concerns whether revoking a later will that had itself revoked an earlier will restores the earlier will. Under the UPC, revocation of the second will does not automatically revive the first; the first will is revived only if the circumstances or the testator's contemporaneous declarations show an intent that it take effect again.

A divorce or annulment after a will's execution revokes all provisions in favor of the former spouse (and, under the UPC, the former spouse's relatives), treating the ex-spouse as having predeceased the testator. Some states also provide that a subsequent marriage entitles an omitted spouse to a share, and the birth of children after execution triggers pretermitted-child protections.

A gift lapses if the beneficiary predeceases the testator, ordinarily causing it to fall into the residue or pass by intestacy. An anti-lapse statute saves the gift by substituting the descendants of the predeceased beneficiary, but only if the beneficiary was within a specified degree of relationship to the testator (under the UPC, a grandparent or descendant of a grandparent).

A class gift is a gift to a group of persons described collectively (such as the testator's children), with the surviving members generally dividing the share of any class member who predeceases the testator. The anti-lapse statute applies first if the deceased member falls within its protected relationships, and the class typically closes under the rule of convenience when distribution is due.

Ademption by extinction occurs when specifically devised property is not in the testator's estate at death, causing the gift to fail under the traditional identity theory (the UPC favors an intent-based approach with exceptions). Ademption by satisfaction occurs when the testator makes a lifetime gift intended to satisfy a devise, which under the UPC requires a contemporaneous writing.

When estate assets are insufficient to pay debts and all gifts, the gifts abate (are reduced) in a set order: first intestate property, then the residuary, then general gifts, and last specific and demonstrative gifts. Within each category gifts abate pro rata, and abatement may be adjusted to carry out the testator's apparent intent.

At common law, a specific devisee of encumbered property was entitled to have the lien exonerated (paid) from the residue, but the modern UPC abolishes that presumption so the devisee takes subject to the lien unless the will directs otherwise. By contrast, accessions such as stock splits and reinvested securities generally pass with a specific gift of securities.

A will procured by undue influence is invalid where another's influence overpowered the testator's free will and caused a disposition the testator would not otherwise have made. A presumption of undue influence arises when a person in a confidential relationship with the testator was active in procuring the will and receives a substantial benefit, shifting the burden to that beneficiary.

Fraud invalidates a will where a misrepresentation made with intent to deceive causes the testator to execute or change the will (fraud in the execution or in the inducement). Duress involves coercion by threat, and while courts rarely reform for a mistake in the inducement, the UPC and Restatement permit reformation of a will for mistake shown by clear and convincing evidence.

Only an interested party, such as an heir or beneficiary whose share would increase if the will (or a provision) failed, has standing to contest a will. A no-contest (in terrorem) clause forfeits a beneficiary's gift if he challenges the will, but under the UPC and many states the clause is unenforceable against a contestant who had probable cause to bring the challenge.

A surviving spouse may renounce the will and instead take a statutory elective (forced) share, commonly one-third or one-half of the estate, to prevent disinheritance. The modern UPC ties the share to the length of the marriage using an augmented estate that includes certain nonprobate transfers; this protection exists only in separate-property states, since community property already gives the spouse a half interest.

An omitted (pretermitted) spouse whom the testator married after executing the will generally receives an intestate share unless the omission appears intentional or was provided for outside the will. An omitted child born or adopted after execution similarly receives a share unless the omission was intentional, the testator provided for the child otherwise, or left the estate to the child's other parent.

In addition to other rights, a surviving spouse and minor children may claim a homestead allowance, a set amount of exempt personal property, and a reasonable family allowance for maintenance during administration. These protections take priority over creditors and general devisees and are in addition to, not in lieu of, any share passing by will or intestacy.

A valid trust requires a settlor with capacity who manifests a present intent to create a trust, identifiable trust property (res), and a lawful purpose. Precatory language expressing a mere wish or hope generally does not create a trust, and a trust fails for lack of a res where there is no presently existing, segregated property to which the trust attaches.

A private trust must have one or more ascertainable beneficiaries capable of enforcing it, although a charitable trust may have indefinite beneficiaries. A trust will not fail for lack of a trustee, as a court will appoint one to carry out the settlor's intent, but a trust requires that legal and equitable title not merge in the same single person.

A trust may be created by a lifetime declaration (the settlor declares himself trustee), an inter vivos transfer of property to a trustee, or a testamentary trust in a will. An oral trust of personal property may be valid, but a trust of land must satisfy the Statute of Frauds with a writing.

Under the UTC, a trust is presumed revocable unless its terms expressly state otherwise, reversing the common-law presumption of irrevocability. A revocable trust allows the settlor to amend or revoke and retain control during life, while an irrevocable trust cannot be unilaterally changed and offers greater creditor and tax-planning advantages.

A charitable trust must have a recognized charitable purpose (such as relief of poverty, advancement of education, or other community benefit), may last indefinitely free of the Rule Against Perpetuities, and is enforced by the state attorney general. Under cy pres, if the specific charitable purpose becomes impossible or impracticable, a court may redirect the property to a similar charitable purpose consistent with the settlor's general charitable intent.

A spendthrift trust bars the beneficiary from voluntarily or involuntarily transferring his interest, so creditors generally cannot reach the interest until distributions are made. A support trust directs the trustee to pay only what is needed for the beneficiary's support, while a discretionary trust gives the trustee discretion over distributions, leaving creditors with no greater rights than the beneficiary.

A resulting trust arises by operation of law to return property to the settlor or his estate when an express trust fails or does not exhaust the trust property. A constructive trust is an equitable remedy, not a true trust, imposed to prevent unjust enrichment where someone holds property obtained through fraud, breach of duty, or other wrongdoing.

An honorary trust has no human beneficiary to enforce it and is created for a specific noncharitable purpose, such as the care of a pet or the maintenance of a gravesite. The modern UTC validates trusts for the care of an animal alive during the settlor's life and other noncharitable purpose trusts, typically subject to a 21-year duration limit and court enforcement.

A trustee owes an undivided duty of loyalty to administer the trust solely in the interest of the beneficiaries. Transactions involving self-dealing are subject to the no-further-inquiry rule and are voidable by a beneficiary regardless of the trustee's good faith or the fairness of the terms, unless authorized by the trust, a court, or beneficiary consent.

Under the Uniform Prudent Investor Act, a trustee must invest as a prudent investor would, evaluating investments as part of an overall portfolio strategy with reasonable risk and return objectives and a duty to diversify. The trustee must also act with impartiality among income and remainder beneficiaries, balancing their competing interests fairly.

A trustee has a duty to keep beneficiaries reasonably informed and to provide accountings of trust administration on request. While the historic rule barred delegation of discretionary functions, the modern UPIA & UTC permit a trustee to delegate investment and management functions that a prudent trustee of comparable skills could properly delegate, exercising care in selecting and monitoring the agent.

A trustee who breaches a fiduciary duty is liable to make the trust whole, measured by the resulting loss in value, the trustee's profit from the breach, or the profit the trust would have earned absent the breach. Beneficiaries may also trace misappropriated property and recover it from the trustee or a non-bona-fide-purchaser transferee, and an exculpatory clause cannot excuse bad faith or reckless conduct.

Under the Claflin doctrine, beneficiaries may compel modification or termination only if all beneficiaries consent and doing so would not frustrate a material purpose of the trust. Spendthrift, support, and discretionary provisions are typically deemed material purposes, so a trust may not be terminated early even with unanimous consent where an unfulfilled material purpose remains.

A court may modify a trust's administrative or distributive terms when unanticipated circumstances threaten to defeat or substantially impair the accomplishment of the trust's purposes (the doctrine of equitable deviation). Under the UTC, a court may also modify or terminate an uneconomic small trust, or reform terms to correct a mistake or achieve the settlor's tax objectives.

A power of appointment authorizes the donee to designate who receives property. A general power permits appointment to the donee, his estate, his creditors, or the creditors of his estate, exposing the property to the donee's creditors, while a special (limited) power restricts appointment to a defined class excluding the donee. A power may be exercisable during life (inter vivos) or only by will (testamentary).

A donee exercises a power of appointment only by manifesting the required intent, and where the donor demands a specific reference to the power, a general residuary clause is insufficient to exercise it. If the donee fails to exercise the power, the property passes to any takers in default, or, absent such a gift, reverts to the donor's estate (or, for a special power, often to the permissible appointees).

The Rule Against Perpetuities requires that a contingent future interest must vest, if at all, within 21 years after a life in being at the interest's creation, or it is void. Many jurisdictions have adopted reforms such as wait-and-see or the USRAP 90-year period, and charitable trusts and most administrative trust interests are exempt from the Rule's reach.