Illegal use of drugs
Illegal use of drugs means the use of drugs, the possession or distribution of which is unlawful under the Controlled Substances Act, as amended (21 U.S.C. 812). Illegal use of drugs does not include the use of a drug taken under supervision of a licensed health care professional, or other uses authorized by the Controlled Substances Act or other provisions of Federal law.
29 CFR § 37.4
As used in this part, the term: