S.C. Code Ann. § 56-5-765 – Investigations of traffic collisions involving a motor vehicle or motorcycle of a law enforcement agency or the Department of Public Safety

(A) When a motor vehicle or motorcycle of a law enforcement agency, except a motor vehicle or motorcycle operated by the department, is involved in a traffic collision that results in an injury or a death, or involves a privately-owned motor vehicle or motorcycle, regardless of whether another motor vehicle or motorcycle is involved, the State Highway Patrol shall investigate the collision and file a report with findings on whether the agency motor vehicle or motorcycle was operated properly within the guidelines of appropriate statutes and regulations.
(B) When a motor vehicle or motorcycle of the department is involved in a traffic collision that results in an injury or a death, or involves a privately-owned motor vehicle or motorcycle, regardless of whether another motor vehicle or motorcycle is involved, the sheriff of the county in which the collision occurred shall investigate the collision, regardless of whether the collision occurred within an incorporated jurisdiction, and file a report with findings on whether the department's motor vehicle or motorcycle was operated properly within the guidelines of appropriate statutes and regulations.
(C) A law enforcement department or agency may not investigate collisions in which a motor vehicle or an employee of that department or agency is involved that results in an injury or a death, or involves a privately-owned motor vehicle or motorcycle, regardless of whether another motor vehicle or motorcycle is involved.
(D) Any person wilfully violating the provisions of subsection (C) shall be subject to punishment as provided in Section 8-1-80, even if the person's authority extends beyond a single election or judicial district.