The Omnibus Transportation Employee Testing Act of 1991 requires drug and alcohol testing of safety-sensitive transportation employees. This includes aviation, trucking, railroads, and other transportation industries. The Department of Transportation publishes rules on who must conduct drug and alcohol tests. It determines how to conduct those tests and what procedures to use when testing.
These regulations cover all transportation employers, safety-sensitive transportation employees and service agents - roughly 12.1 million people. The Office of Drug and Alcohol Policy and Compliance (ODAPC) publishes, implements and provides authoritative interpretations of these rules. This is encompassed in the title 49 Code of Federal Regulations (CFR) Part 40.