Section 655.21 - Drug testing(a) An employer shall establish a program that provides testing for prohibited drugs and drug metabolites in the following circumstances: pre-employment, post-accident, reasonable suspicion, random, and return to duty/follow-up.(b) When administering a drug test, an employer shall ensure that the following drugs are tested for: (c) Consumption of these products is prohibited at all times. 66 FR 42002 , Aug. 9, 2001, as amended at 84 FR 16775 , Apr. 23, 2019