US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter II — FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 219 — CONTROL OF ALCOHOL AND DRUG USESubpart B — Prohibitions219.10249 C.F.R. § 219.102Prohibition on abuse of controlled substances.Last amended: 2017Year: 2026Length: 29 wordsOfficial source Cite as 49 C.F.R. § 219.102 (2026)No regulated employee may use a controlled substance at any time, whether on duty or off duty, except as permitted by § 219.103. [81 FR 37929, June 10, 2016]Cross-references to the CFR219.103.Previous49 C.F.R. § 219.101Next49 C.F.R. § 219.103