(a) Except as provided in subpart F of this part, no driver shall perform safety-sensitive functions, including driving a commercial motor vehicle, if the driver has engaged in conduct prohibited by subpart B of this part or an alcohol or controlled substances rule of another DOT agency.
(b) No employer shall permit any driver to perform safety-sensitive functions, including driving a commercial motor vehicle, if the employer has determined that the driver has violated this section.
(c) For purposes of this subpart, commercial motor vehicle means a commercial motor vehicle in commerce as defined in § 382.107, and a commercial motor vehicle in interstate commerce as defined in part 390 of this subchapter.
Reproduced verbatim from the electronic Code of Federal Regulations (eCFR), the official U.S. government source. X3 Fleet Safety LLC is a compliance-services company, not a law firm; this page is regulatory reference, not legal advice. X3 is not affiliated with FMCSA or USDOT.