49 CFR § 1503.645 - Expert or opinion witnesses.

---
identifier: "/us/cfr/t49/s1503.645"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 1503.645 - Expert or opinion witnesses."
title_number: 49
title_name: "Transportation"
section_number: "1503.645"
section_name: "Expert or opinion witnesses."
chapter_name: "TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "A"
subchapter_name: "ADMINISTRATIVE AND PROCEDURAL RULES"
part_number: "1503"
part_name: "INVESTIGATIVE AND ENFORCEMENT PROCEDURES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: ": 6 U.S.C. 1142; 18 U.S.C. 6002; 28 U.S.C. 2461 (note); 49 U.S.C. 114, 20109, 31105, 40113-40114, 40119, 44901-44907, 44939, 46101-46107, 46109-46110, 46301, 46305, 46311, 46313-46314; Pub. L. 110-53 (121 Stat. 266, Aug. 3, 2007) secs. 1408 (6 U.S.C. 1137), 1501 (6 U.S.C. 1151), 1517 (6 U.S.C. 1167), and 1534 (6 U.S.C. 1184)."
regulatory_source: "74 FR 36039, July 21, 2009, unless otherwise noted."
cfr_part: "1503"
---


# 1503.645 Expert or opinion witnesses.

An employee of the agency may not be called as an expert or opinion witness, for any party other than TSA, in any proceeding governed by this subpart. An employee of a respondent may not be called by an agency attorney as an expert or opinion witness for TSA in any proceeding governed by this subpart to which the respondent is a party.