Rules of Evidence

Rule 601

Competency to Testify in General

Every person is competent to be a witness unless these rules provide otherwise. But in a civil case, state law governs the witness’s competency regarding a claim or defense for which state law supplies the rule of decision.

Rule 605

Judge’s Competency as a Witness

The presiding judge may not testify as a witness at the trial. A party need not object to preserve the issue.

Rule 606

Juror’s Competency as a Witness

(a) At the Trial. A juror may not testify as a witness before the other jurors at the trial. If a juror is called to testify, the court must give a party an opportunity to object outside the jury’s presence.

(b) During an Inquiry into the Validity of a Verdict or Indictment.

(1) Prohibited Testimony or Other Evidence. During an inquiry into the validity of a verdict or indictment, a juror may not testify about any statement made or incident that occurred during the jury’s deliberations; the effect of anything on that juror’s or another juror’s vote; or any juror’s mental processes concerning the verdict or indictment. The court may not receive a juror’s affidavit or evidence of a juror’s statement on these matters.

(2) Exceptions. A juror may testify about whether:

(A) extraneous prejudicial information was improperly brought to the jury’s attention;

(B) an outside influence was improperly brought to bear on any juror; or

(C) a mistake was made in entering the verdict on the verdict form.

Tule 602

Need for Personal Knowledge

A witness may testify to a matter only if evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may consist of the witness’s own testimony. This rule does not apply to a witness’s expert testimony under Rule 703.

Rule 603

Oath or Affirmation to Testify Truthfully

Before testifying, a witness must give an oath or affirmation to testify truthfully. It must be in a form designed to impress that duty on the witness’s conscience.

Rule 611

Mode and Order of Examining Witnesses and Presenting Evidence

(a) Control by the Court; Purposes. The court should exercise reasonable control over the mode and order of examining witnesses and presenting evidence so as to:

(1) make those procedures effective for determining the truth;

(2) avoid wasting time; and

(3) protect witnesses from harassment or undue embarrassment.

(b) Scope of Cross-Examination. Cross-examination should not go beyond the subject matter of the direct examination and matters affecting the witness’s credibility. The court may allow inquiry into additional matters as if on direct examination.

(c) Leading Questions. Leading questions should not be used on direct examination except as necessary to develop the witness’s testimony. Ordinarily, the court should allow leading questions:

(1) on cross-examination; and

(2) when a party calls a hostile witness, an adverse party, or a witness identified with an adverse party.

Rule 612

Writing Used to Refresh a Witness’s Memory

(a) Scope. This rule gives an adverse party certain options when a witness uses a writing to refresh memory:

(1) while testifying; or

(2) before testifying, if the court decides that justice requires the party to have those options.

(b) Adverse Party’s Options; Deleting Unrelated Matter. Unless 18 U.S.C. § 3500 provides otherwise in a criminal case, an adverse party is entitled to have the writing produced at the hearing, to inspect it, to cross-examine the witness about it, and to introduce in evidence any portion that relates to the witness’s testimony. If the producing party claims that the writing includes unrelated matter, the court must examine the writing in camera, delete any unrelated portion, and order that the rest be delivered to the adverse party. Any portion deleted over objection must be preserved for the record.

(c) Failure to Produce or Deliver the Writing. If a writing is not produced or is not delivered as ordered, the court may issue any appropriate order. But if the prosecution does not comply in a criminal case, the court must strike the witness’s testimony or—if justice so requires—declare a mistrial.

Rule 401

Test for Relevant Evidence

Evidence is relevant if:

(a) it has any tendency to make a fact more or less probable than it would be without the evidence; and

(b) the fact is of consequence in determining the action.