Article IX — Authentication and Identification
Rule 901: Authenticating or Identifying Evidence
What is Authenticating or Identifying Evidence?
Rule 901 establishes the authentication requirement — before any item of evidence can be admitted, the proponent must show that it is what they claim it is. A letter cannot be admitted as being from John unless there is evidence that John actually wrote it. A photograph cannot be admitted as showing the accident scene unless someone testifies it accurately depicts the scene. Authentication is a condition precedent to admissibility.
Source: Fed. R. Evid. 901
Rule Text
To satisfy the requirement of authenticating or identifying an item of evidence, the proponent must produce evidence sufficient to support a finding that the item is what the proponent claims it is. Examples of evidence that satisfies the requirement include: testimony of a witness with knowledge; nonexpert opinion on handwriting; comparison by an expert witness or the trier of fact; distinctive characteristics and the like; opinion about a voice; evidence about a telephone conversation; evidence about public records; evidence about ancient documents or data compilations; evidence about a process or system; and methods provided by a statute or rule.
Plain English Explanation
Rule 901 establishes the authentication requirement — before any item of evidence can be admitted, the proponent must show that it is what they claim it is. A letter cannot be admitted as being from John unless there is evidence that John actually wrote it. A photograph cannot be admitted as showing the accident scene unless someone testifies it accurately depicts the scene. Authentication is a condition precedent to admissibility.
The standard is relatively low: the proponent need only produce enough evidence to support a finding that the item is what it purports to be. This is a conditional relevance standard under Rule 104(b), meaning the judge does not decide whether the item is authentic — only whether there is enough evidence for a reasonable jury to find it authentic. The ultimate question of authenticity goes to the jury.
Rule 901(b) provides a non-exhaustive list of authentication methods. These include testimony from someone with knowledge ('I saw the defendant sign this document'), handwriting identification by a non-expert familiar with the person's writing, expert comparison, distinctive characteristics (like letterhead, content, or circumstances), voice identification, telephone conversation identification, and evidence about a process or system (used for computer-generated evidence and digital records). Modern authentication challenges increasingly involve electronic evidence — emails, text messages, social media posts, and digital photos.
Key Points
- 1Authentication requires evidence sufficient to support a finding that the item is what the proponent claims
- 2This is a low threshold — a conditional relevance standard under Rule 104(b)
- 3The judge decides if there is enough evidence for a reasonable jury to find authenticity; the jury decides if it is authentic
- 4Rule 901(b) provides a non-exhaustive list of authentication methods
- 5Modern challenges: authenticating electronic evidence, social media posts, text messages, emails
Common Exam Issues
- Authenticating electronic communications — emails, text messages, social media posts
- Chain of custody for physical evidence — showing the item has not been altered or tampered with
- The low standard — sufficient evidence to support a finding, not proof beyond a reasonable doubt
- Distinguishing authentication (901) from the best evidence rule (1002) — different requirements
Landmark Cases
- United States v. Vayner
- Lorraine v. Markel American Insurance Co.
- United States v. Browne
Article IX — Authentication and Identification
This rule is part of Article IX — Authentication and Identification of the Federal Rules of Evidence.
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