The Federal Rules of Evidence are approved by the United States Congress.

The Federal Rules of Evidence (FRE) are a comprehensive set of guidelines established to govern the admission and use of evidence in federal courts in the United States. Adopted in 1975, the FRE aims to ensure fairness, eliminate unjustifiable expense and delay, and promote the development of evidence law to ascertain truth and secure justice. The rules are divided into key articles covering topics such as general provisions, judicial notice, relevance and its limits, privileges, witnesses, expert testimony, hearsay, and authentication of evidence. For instance, they provide criteria for determining the admissibility of hearsay under exceptions and define the standards for qualifying expert witnesses. These rules serve as a model for many state evidence codes, emphasizing clarity, consistency, and efficiency in legal proceedings.