S.C. Code Regs. 38-382.501
S.C. Code Regs. 38-382.501. Removal from safety-sensitive function
(a) Except as provided in subpart F of 38-382, 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 38-382 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 38-382.
(c) For purposes of this subpart, commercial motor vehicle means a commercial motor vehicle in commerce as defined in Regulation 38-382.107, and a commercial motor vehicle in interstate commerce as defined in part 38-390 of this regulation.