Overview
Summary of Rule 901 authentication: offering evidence requires showing it is what the proponent claims, a low-threshold, common-sense standard aligned with Rule 104(b).
Authentication Standard and Relationship to Other Rules
- Evidence must be relevant under Rules 401–402 to be admissible.
- Rule 403 balancing: probative value must not be substantially outweighed by prejudice.
- Hearsay statements require an exception before admission.
- Rule 901: produce some evidence that the item is what it claims to be.
- Standard mirrors Rule 104(b): judge decides if a jury could find authenticity.
Methods of Authentication
- Witness with knowledge identifies the item as claimed.
- Chain of custody can establish continuity for physical evidence.
- Lay opinion on handwriting based on familiarity is acceptable.
- Comparison by expert or trier with an authenticated specimen.
- Distinctive characteristics can support authenticity.
- Voice recognition by someone familiar with the speaker’s voice.
- Telephone calls authenticated by dialing a known number and the answer.
- Public, business, and ancient records via expected location and appearance.
- Evidence from a system or process, explained by a knowledgeable witness.
Examples and Applications
- Gun from a crime scene identified by officer’s tag and initials.
- Parties sometimes waive chain of custody to streamline proof.
- Handwriting authenticated by someone who knows the writer’s script.
- Expert comparison of known and questioned samples, including beyond handwriting.
- Recognizable voices (e.g., distinctive broadcasters) support identification.
- Calling a known number; answerer says name or is otherwise identified.
- Traffic cameras: setup, trigger on red light, resulting images authenticated.
- Laboratory instruments: process description authenticates printouts and results.
Structured Summary of Rule 901 Methods
| Method | Description | Illustrative Example |
|---|
| Witness with knowledge | Person testifies item is what it is claimed to be | Officer identifies tagged gun from scene |
| Chain of custody | Show item remained undisturbed from seizure to court | Evidence locker handling; often waived |
| Lay handwriting opinion | Familiar witness identifies handwriting | “I know Bob’s handwriting” |
| Comparison by expert/trier | Compare known specimen to questioned item | Expert compares known and seized samples |
| Distinctive characteristics | Item’s features indicate source or nature | Currency or historically distinctive coins |
| Voice identification | Familiar listener recognizes voice | Identifying a well-known announcer’s voice |
| Telephone evidence | Called known number; appropriate answer | Calling Bob’s number; “This is Bob” or hello |
| Public/business/ancient records | Found where expected; appears trustworthy | Records located in expected repository |
| System or process | Explain device/process producing result | Lab chromatograph printout; traffic camera photo |
Key Takeaways
- Authentication is a low bar: offer something supporting identity of the evidence.
- Judge screens under Rule 104(b); jury ultimately weighs authenticity.
- Approach is pragmatic and fact-specific; hearsay and relevance still apply.