U.S Code last checked for updates: Jun 18, 2021
Rule 701.
Opinion Testimony by Lay Witnesses
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.
(Pub. L. 93–595, § 1, Jan. 2, 1975, 88 Stat. 1937; Mar. 2, 1987, eff. Oct. 1, 1987; Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 26, 2011, eff. Dec. 1, 2011.)