Federal Rules of Evidence, official text as in effect December 1, 2024.
All 69 rules are searchable in TrialMate with no signal, which is what a courtroom usually leaves you. The amendment to Rule 801 takes effect in the app on December 1, 2026.
An expert may base an opinion on facts or data in the case that the expert has been made aware of or personally observed. If experts in the particular field would reasonably rely on those kinds of facts or data in forming an opinion on the subject, they need not be admissible for the opinion to be admitted. But if the facts or data would otherwise be inadmissible, the proponent of the opinion may disclose them to the jury only if their probative value in helping the jury evaluate the opinion substantially outweighs their prejudicial effect.
(As amended Mar. 2, 1987, eff. Oct. 1, 1987; Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 26, 2011, eff. Dec. 1, 2011.)
Source: Federal Rules of Evidence, December 1, 2024, Administrative Office of the United States Courts, uscourts.gov.
This page reproduces the official text of the Federal Rules of Evidence for reference. It is not legal advice and adds no commentary. It does not replace the official publication, local rules, or the law that applies in your court. Check the current official text before relying on it.