South carolina constitution
Article VIII: local government
Section 7

The General Assembly shall provide by general law for the structure, organization, powers, duties, functions, and the responsibilities of counties, including the power to tax different areas at different rates of taxation related to the nature and level of governmental services provided. Alternate forms of government, not to exceed five, shall be established. No laws for a specific county shall be enacted and no county shall be exempted from the general laws or laws applicable to the selected alternative form of government.