(a) Each air traffic control facility not operated by the FAA or the U.S. military must establish an alcohol testing program in accordance with the provisions of subpart F of this part.
(b) No employer shall use any individual who meets the definition of covered employee in subpart A of this part to perform a safety-sensitive function listed in subpart F of this part unless that individual is subject to testing for alcohol misuse in accordance with the provisions of that subpart.
ACE rules page: Part 120 in plain English