{"data":{"id":"us/49-cfr-1503.645","jurisdiction":"us","citation":"49 CFR 1503.645","heading":"Expert or opinion witnesses.","body":"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.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER XII—TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER A—ADMINISTRATIVE AND PROCEDURAL RULES","PART 1503—INVESTIGATIVE AND ENFORCEMENT PROCEDURES","Subpart G—Rules of Practice in TSA Civil Penalty Actions"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"a0349e88fe339dc7905f1777db02922a372745b732a49e71f8a12699148463cd","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-1503.643","next":"us/49-cfr-1503.647"},"notice":"GroundRules: Original legal text. Not legal advice."}