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Legal Resources | Code of Federal Regulations, Title 49 |    382.309, 382.309  

Return-to-duty testing.   

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(a) Each employer shall ensure that before a driver returns to duty requiring the performance of a safety-sensitive function after engaging in conduct prohibited by subpart B of this part concerning alcohol, the driver shall undergo a return-to-duty alcohol test with a result indicating an alcohol concentration of less than 0.02.

(b) Each employer shall ensure that before a driver returns to duty requiring the performance of a safety-sensitive function after engaging in conduct prohibited by subpart B of this part concerning controlled substances, the driver shall undergo a return-to-duty controlled substances test with a result indicating a verified negative result for controlled substances use.