29 CFR 18.602 : Labor (§ 0.735-1 To Parts 4908-4999) — (§ 0.735-1 To § 99.530) — Office Of The Secretary Of Labor (§ 0.735-1 To § 99.530) — Rules Of Practice And Procedure For Administrative Hearings Before The Office Of Administrative Law Judges (§ 18.10 To Appendix To Subpart B Of Part 18) — Rules Of Evidence (§ 18.101 To Appendix To Subpart B Of Part 18) — Witnesses (§ 18.601 To § 18.615) — Lack of personal knowledge.

4 Aug 2016

A witness may not testify to a matter unless evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may, but need not, consist of the witness' own testimony. This rule is subject to the provisions of § 18.703, relating to opinion testimony by expert witnesses.

29 CFR 18.602