Authentication

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

One-line summary

Before an exhibit can be admitted, the proponent must produce evidence sufficient to support a finding that the item is what it is claimed to be — and certain items are self-authenticating.

Mnemonic

F-R-E-901 + 902 — Foundation, Reasonable proof, Evidence of identity; 902 = self-authenticating shortcuts.

Or remember the goal as "P-I-C-Y" — Prove It's the Claimed Year / thing.

The rule (FRE 901)

Authentication is satisfied by evidence sufficient to support a finding that the item is what its proponent claims. This is a low threshold — conditional relevance under FRE 104(b). The jury ultimately decides how much to trust the evidence.

Methods of authentication (FRE 901(b))

The rule lists non-exclusive examples:

1. Testimony of a witness with knowledge — identifies the item.
2. Non-expert opinion on handwriting — based on familiarity not acquired for litigation.
3. Expert comparison — document or handwriting compared to authenticated specimen.
4. Distinctive characteristics — appearance, contents, substance, pattern, with circumstances.
5. Opinion on voice identification — once heard (in any manner) connecting voice to speaker.
6. Phone-call evidence — number called and self-identification, plus circumstances linking.
7. Public records — from office where such records are kept.
8. Ancient documents — 20+ years old, free of suspicion, in proper custody.
9. Process or system — showing it produced accurate result.
10. Methods in statutes or rules.

Self-authentication (FRE 902)

No extrinsic evidence needed:

• Domestic public documents sealed and signed.
• Domestic public documents not sealed but signed and certified.
• Foreign public documents (with appropriate certifications).
• Certified copies of public records.
• Official publications issued by public authority.
• Newspapers and periodicals.
• Trade inscriptions / labels affixed in course of business.
• Acknowledged documents (notarized).
• Commercial paper under UCC (§ 3-308).
• Presumptions under federal statute.
• Certified domestic and foreign business records (sometimes available under § 902(11)-(14)).
• Electronic evidence and data — § 902(13) and (14) certifications for electronic process / copies of electronically stored information.

Digital and electronic evidence

• Emails — authenticate by sender/recipient, metadata, content, distinctive markings.
• Text messages — phone numbers, content, reply behavior.
• Social media — account ownership + distinctive content + context (Griffin v. State, Tienda v. State).
• Server / database extracts — custodian testimony, audit logs, 902(13)/(14) certifications.
• Surveillance video — witness who was there or silent-witness theory (process-or-system).
• Photographs — witness familiar with scene confirms fair/accurate representation.

Chain of custody

• Required for items whose nature changes or could be tampered with (drugs, DNA).
• Breaks go to weight, not admissibility, unless fundamental integrity compromised.

Best Evidence Rule (FRE 1001-1008) — companion

• Rule 1002 — to prove content of writing, recording, photograph — original required (or duplicate; or excuse).
• Does NOT require originals to prove events themselves.
• Duplicates (FRE 1003) — admissible unless genuine question of authenticity or unfair to admit.
• Admissible secondary evidence when original lost, destroyed (not in bad faith), unobtainable, controlled by opponent who fails to produce.

NCBE loves to test

• Low threshold. Authentication is preliminary; ultimate weight goes to jury.
• Self-authentication. No extrinsic evidence needed; read the rule's list.
• Digital evidence. Courts require more than mere owner-of-account; content + distinctive details.
• Ancient-documents trap. 20 years + proper custody + no suspicion; content is admissible subject to other rules (hearsay).
• Best-Evidence Rule applies only to proving content. Testimony about what happened does not trigger.
• Chain-of-custody imperfections. Go to weight unless integrity compromised.
• Proponent's burden. Opponent can challenge, but proponent only needs prima facie.

Fast hypos

Hypo 1. Plaintiff offers a printed email from defendant. Defendant disputes. Proponent authenticates via distinctive content, email address, reply pattern, metadata; 901(b)(4) catchall works.

Hypo 2. Contract has a notary seal. Self-authenticating under 902(8).

Hypo 3. Photograph of accident scene. Witness familiar with location testifies it's a fair and accurate representation. Authenticated via 901(b)(1).

Hypo 4. Surveillance video from store. No eyewitness. Silent witness theory — testimony about the recording system's operation, custodianship, and integrity of footage.

Hypo 5. Text message from an unknown number. Proponent offers only the number. Insufficient — need additional circumstantial evidence linking number to alleged sender.

Case anchors

• United States v. Siddiqui, 235 F.3d 1318 (11th Cir. 2000) — email authentication through distinctive characteristics.
• Griffin v. State, 19 A.3d 415 (Md. 2011) — careful authentication required for social media.
• Tienda v. State, 358 S.W.3d 633 (Tex. Crim. App. 2012) — social media authentication via content and context.
• United States v. Safavian, 435 F. Supp. 2d 36 (D.D.C. 2006) — email authentication primer.

See also

• Hearsay
• Impeachment
• Character
• Relevance — FRE 403

Sources

Fed. R. Evid. 104(b), 901, 902, 1001-1008; United States v. Siddiqui, 235 F.3d 1318 (11th Cir. 2000); Griffin v. State, 19 A.3d 415 (Md. 2011); Tienda v. State, 358 S.W.3d 633 (Tex. Crim. App. 2012); United States v. Safavian, 435 F. Supp. 2d 36 (D.D.C. 2006).