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Character Evidence

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Bar Exam Resources / Mnemonics  •  April 23, 2026 •  4 min read •  Article

Character Evidence

MBEMax wiki article — paired with the Evidence question set on mbemax.com.

One-line summary

Character evidence — evidence of a person's propensity — is generally inadmissible to prove conduct on a particular occasion, but multiple exceptions allow its use in both criminal and civil cases for different purposes and through different forms.

Mnemonic

MIMICMotive, Intent, absence of Mistake, Identity, Common plan.

And three forms with a separate mnemonic — R-O-S: Reputation, Opinion, Specific instances.

The basic rule (FRE 404)

Evidence of a person's character is not admissible to prove that, on a particular occasion, the person acted in accordance with the character.

But the same rule has important exceptions:

  • 404(a)(2)(A) — Criminal defendant may offer evidence of a pertinent trait of his own character. Prosecution may then rebut.
  • 404(a)(2)(B) — Criminal defendant may offer evidence of a pertinent trait of the victim's character (self-defense → violence). Prosecution may then rebut with victim's trait AND defendant's same trait.
  • 404(a)(3) — Witnesses — see Impeachment.
  • 404(b) — Evidence of other crimes, wrongs, or acts NOT to prove propensity but for non-propensity purposes (MIMIC: motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, lack of accident).

Forms of character evidence (FRE 405)

  • 405(a) — Reputation or opinion — both admissible whenever character is in issue or admissible under an exception.
  • 405(b) — Specific instances — admissible on direct only when character itself is an element (defamation, negligent entrustment, some entrapment defenses). On cross, specific instances may be used to test the witness's knowledge of reputation/opinion.

Specific rules

  • Propensity in general civil cases — not admissible to show conduct in conformity.
  • Sexual assault and child molestation (FRE 413–415) — prior similar acts ARE admissible to show propensity in both criminal and civil cases involving sexual assault or child molestation.
  • Habit and routine practice (FRE 406) — admissible to prove conforming conduct. Distinguish from character: habit is specific, consistent response to a specific situation.
  • Rape-shield (FRE 412) — restrictions on admission of victim's sexual behavior / predisposition in sexual-misconduct cases, with narrow exceptions.

NCBE loves to test

  • MIMIC use. Prior acts admissible for non-propensity purpose require: (1) relevance for the non-propensity purpose, (2) proof sufficient to support a jury finding the act occurred (preponderance — Huddleston), (3) FRE 403 balancing, (4) limiting instruction on request.
  • Defendant opens the door. If defendant offers good character, prosecution may rebut with opinion/reputation AND (on cross) specific instances in the defendant's past that are probative of the same trait.
  • Victim's violent character. In a self-defense case, defendant can offer evidence of victim's violent character. Prosecution may rebut with victim's peaceable character AND defendant's violent character (FRE 404(a)(2)(B)).
  • Character "in issue." Libel, child custody, negligent entrustment, negligent hiring/retention — character IS an element; specific instances admissible on direct.
  • Habit vs. character. "Always buckles his seatbelt when he gets in a car" = habit. "Is generally a careful person" = character.
  • 413-415 twist. In sexual-misconduct cases, propensity is admissible; FRE 403 still applies.
  • Rape-shield exceptions. Prior sexual conduct with defendant when consent is at issue; prior conduct to prove source of semen/injury; constitutional exception where exclusion would violate defendant's rights.

Fast hypos

Hypo 1. Criminal theft trial. D offers evidence that he is "an honest person." FRE 404(a)(2)(A) — admissible; prosecution may rebut with opinion/reputation and cross with specific dishonest acts.

Hypo 2. Prosecution's case-in-chief in a fraud case. Government offers evidence of D's previous fraudulent conduct with other victims, same pattern. FRE 404(b) — admissible for MIMIC (common plan, identity, intent) after *Huddleston showing.*

Hypo 3. Negligent entrustment suit. Plaintiff offers evidence of prior reckless driving by the person to whom vehicle was entrusted. Character "in issue" — specific instances admissible under FRE 405(b).

Hypo 4. Sexual assault trial. Prosecution offers evidence of defendant's prior sexual assault of another victim. FRE 413 — admissible as propensity evidence; still subject to FRE 403.

Hypo 5. Torts suit — defendant's habit of speeding on a particular stretch of road every morning. FRE 406 habit — admissible to prove conforming conduct.

Case anchors

  • Huddleston v. United States, 485 U.S. 681 (1988) — preponderance standard for FRE 404(b) evidence.
  • Old Chief v. United States, 519 U.S. 172 (1997) — stipulation to prior-felon status limited need for detail.
  • Michelson v. United States, 335 U.S. 469 (1948) — classic treatment of reputation / cross with prior acts.
  • Doe v. Glanzer, 232 F.3d 1258 (9th Cir. 2000) — FRE 413/414 constitutionality.

See also

Sources

Fed. R. Evid. 401, 403, 404, 405, 406, 412, 413, 414, 415, 608, 609; Huddleston v. United States, 485 U.S. 681 (1988); Old Chief v. United States, 519 U.S. 172 (1997); Michelson v. United States, 335 U.S. 469 (1948).

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