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  4. Rule 701. Opinion Testimony by Lay Witnesses
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Federal Rules of Evidence

Rule 701. Opinion Testimony by Lay Witnesses

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    If a witness is not testifying as an expert, testimony in the form of an opinion is limited to one that is:

    (a) rationally based on the witness’s perception;

    (b) helpful to clearly understanding the witness’s testimony or to determining a fact in issue; and

    (c) not based on scientific, technical, or other specialized knowledge within the scope of Rule 702.

    Previous ruleRule 615. Excluding Witnesses from the Courtroom; Preventing an Excluded Witness’s Access to Trial Testimony Next ruleRule 702. Testimony by Expert Witnesses
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