S.C. Code Ann. § 56-1-2110 – Disqualification from driving commercial motor vehicle

(A) A person is disqualified from driving a commercial motor vehicle for not less than one year if convicted of a first violation of:
1. (1) driving a commercial motor vehicle under the influence of alcohol, a controlled substance, or a drug which impairs driving ability;
2. (2) driving a commercial motor vehicle while the alcohol concentration of the person's blood or breath or other bodily substance is four-one hundredths or more;
3. (3) knowingly and wilfully leaving the scene of an accident involving a commercial motor vehicle driven by the person;
4. (4) using a commercial motor vehicle in the commission of a felony as defined in this article;
5. (5) refusal to submit to a test to determine the driver's alcohol concentration while driving a commercial motor vehicle.
  If any of the above violations occur while transporting a hazardous material required to be placarded, the person is disqualified for not less than three years.
(B) A person is disqualified for life if convicted of two or more violations of any of the offenses specified in subsection (A) or a combination of those offenses, arising from two or more separate incidents.
(C) Only offenses committed after the effective date of this article may be considered in applying this subsection.
(D) The department may issue regulations establishing guidelines, including conditions, under which a disqualification for life under subsection (B) may be reduced to not less than ten years.
(E) A person is disqualified from driving a commercial motor vehicle for life who uses a commercial motor vehicle in the commission of a felony involving the manufacture, distribution, or dispensing of a controlled substance or possession with intent to manufacture, distribute, or dispense a controlled substance.
(F) A person is disqualified from driving a commercial motor vehicle for not less than sixty days if convicted of two serious traffic violations or one hundred twenty days if convicted of three serious traffic violations, committed in a commercial motor vehicle arising from separate incidents occurring within a three-year period.
(G) After suspending, revoking, or canceling a commercial driver license, the department shall update its records to reflect that action immediately. After suspending, revoking, or canceling a nonresident commercial driver's privilege, the department shall notify the licensing authority of the state which issued the commercial driver license or commercial driver instruction permit within ten days.