S.C. Code Regs. § § 103-223
It shall be the duty of the carrier, before taking possession of any motor vehicle equipment, to inspect the same or to have the same inspected by a person who is competent and qualified to make such inspection and who has been duly authorized by such carrier to make such inspection as a representative of the carrier, in order to insure that the said equipment complies with motor carrier safety regulations. The person making the inspection shall certify the results thereof in writing. If his/her inspection discloses that the equipment does not comply with the requirements of safety regulations, possession thereof shall not be taken. This written document shall be countersigned by someone in a supervisory capacity with the lessee indicating that the person performing the inspection was qualified to do so.
S.C. Code Regs. § 103-223