49 CFR §1503.645
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.