CFR›Title 29›Subtitle A›Part 18›Subpart B›Subject Group Opinions and Expert Testimony ContainsSections 18.701–18.706CorpusDaily eCFRDisplayed edition2026-04-28Last updated2026-04-28 Sections 18.701 § 18.701 Opinion testimony by lay witnesses. 18.702 § 18.702 Testimony by experts. 18.703 § 18.703 Bases of opinion testimony by experts. 18.704 § 18.704 Opinion on ultimate issue. 18.705 § 18.705 Disclosure of facts or data underlying expert opinion. 18.706 § 18.706 Judge appointed experts. Previous Official Notice Official Notice Next Presumptions Presumptions