{"data":{"id":"us/49-cfr-1503.639","jurisdiction":"us","citation":"49 CFR 1503.639","heading":"Burden of proof.","body":"(a) Except in the case of an affirmative defense, the burden of proof is on the agency.\n(b) Except as otherwise provided by statute or rule, the proponent of a motion, request, or order has the burden of proof.\n(c) A party who has asserted an affirmative defense has the burden of proving the affirmative defense.","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":"a43e99aa9616b0e2dde8894effb20d79bc73ae27d1335a89a17bb74cbfe80e76","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-1503.637","next":"us/49-cfr-1503.641"},"notice":"GroundRules: Original legal text. Not legal advice."}