S.C. Code Ann. § 58-17-1670

The Office of Regulatory Staff may examine all agents and employees of railroad companies and other persons under oath and otherwise, in order to procure the necessary information to make just and reasonable rates of freight and passenger tariffs, and to ascertain if rules and regulations are observed or violated and to propose to the commission necessary and proper rules and regulations concerning the examinations. The rules and regulations herein provided for must be obeyed and enforced as all other rules and regulations provided for in this chapter.