Rule · Federal Rules of Evidence

Fed. R. Evid. 705 — Disclosing the Facts or Data Underlying an Expert’s Opinion

Fed. R. Evid. 705

Type: Rule
Source: Federal Rules of Evidence
Jurisdiction: Federal
Date: 2026-10-22

Unless the court orders otherwise, an expert may state an opinion—and give the reasons for it—without first testifying to the underlying facts or data. But the expert may be required to disclose those facts or data on cross-examination.

Citator

Fed. R. Evid. 705 — Disclosing the Facts or Data Underlying an Expert’s Opinion is in force in the current edition of the Code, and nothing recorded condemns it.

Unless the court orders otherwise, an expert may state an opinion—and give the reasons for it—without first testifying to the underlying facts or data. But the expert may be required to disclose those facts or data on cross-examination.