S.C. Code Ann. § 8-13-770
A member of the General Assembly may not serve in any capacity as a member of a state board or commission, except for the State Budget and Control Board, the Advisory Commission on Intergovernmental Relations, the Legislative Audit Council, the Legislative Council, the Legislative Information Systems, the Judicial Council, the Sentencing Guidelines Commission, the Commission on Prosecution Coordination, the South Carolina Tobacco Community Development Board, the Tobacco Settlement Revenue Management Authority, the South Carolina Transportation Infrastructure Bank, and the joint legislative committees.