S.C. Code § 56-3-1710
The Department of Motor Vehicles shall design and supply, at an appropriate fee, a special license plate, or supplemental plate or attachment, for use on all publicly-owned motor vehicles operated by any department or institution of the State of South Carolina, or any of its political subdivisions. It shall be unlawful for any such publicly-owned vehicle to be operated in the State of South Carolina that does not carry such official emblem, marker, or plates. Provided, however, that this provision shall not apply to the automobile supplied for the Governor's personal use, automobiles supplied to law enforcement officers, when in the opinion of the chief of the South Carolina Law Enforcement Division or the director of the department it is advisable that such automobiles not be so marked, nor to automobiles supplied to other state officials.
S.C. Code § 56-3-1710