S.C. Code Ann. § 56-1-2060

(A) Each employer shall require the information specified in Section 56-1-2050(C). (B) An employer knowingly may not allow, permit, or authorize a person to drive a commercial motor vehicle during a period in which: (1) the person's commercial driver's license is suspended, revoked, or canceled by a state, has lost the privilege to drive a commercial motor vehicle in a state, is disqualified from driving a commercial motor vehicle, or is subject to an out-of-service order in a state; (2) the person has more than one driver's license, except during the ten- day period beginning on the date the employee is issued a driver's license; (3) an employer who knowingly allows, permits, or authorizes a person to drive a commercial motor vehicle during a period in which either the vehicle or the person is subject to an out-of-service order is subject to a civil penalty of not less than two thousand seven hundred fifty dollars nor more than eleven thousand dollars; or (4) the employer is in violation of a federal, state, or local law or regulation pertaining to railroad-highway grade crossings. (C) An employer who is convicted of a violation of 49 CFR 383.37(d) is subject to a civil penalty of not more than ten thousand dollars.