49 U.S.C. § 45103 — Prohibited service

An individual may not use alcohol or a controlled substance after October 28, 1991, in violation of law or a United States Government regulation and serve as an airman, crewmember, airport security screening employee, air carrier employee responsible for safety-sensitive functions (as decided by the Administrator of the Federal Aviation Administration), or employee of the Administration with responsibility for safety-sensitive functions.

Notwithstanding subsection (a) of this section, an individual found to have used alcohol or a controlled substance after October 28, 1991, in violation of law or a Government regulation may serve as an airman, crewmember, airport security screening employee, air carrier employee responsible for safety-sensitive functions (as decided by the Administrator), or employee of the Administration with responsibility for safety-sensitive functions only if the individual completes a rehabilitation program described in section 45105 of this title.

An individual who served as an airman, crewmember, airport security screening employee, air carrier employee responsible for safety-sensitive functions (as decided by the Administrator), or employee of the Administration with responsibility for safety-sensitive functions and who was found by the Administrator to have used alcohol or a controlled substance after October 28, 1991, in violation of law or a Government regulation may not carry out the duties related to air transportation that the individual carried out before the finding of the Administrator if the individual—