US lawFederal (United States)RegulationsTitle 49 CFR — TransportationPart 40 — PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING PROGRAMSAppendix C to Part 4049 C.F.R. Appendix C to Part 40[Reserved]ReservedLast amended: 2023Year: 2026Length: 8 wordsOfficial source Cite as 49 C.F.R. Appendix C to Part 40 (2026)49 C.F.R. Appendix C to Part 40. [Reserved]Previous49 C.F.R. Appendix B to Part 40Next49 C.F.R. Appendix D to Part 40