S.C. Code Ann. § 9-1-510: Option of employees and teachers receiving $100 or less a month; legislators, and certain elected officials.

All employees and teachers having a monthly compensation from public funds of one hundred dollars or less and members of the General Assembly may exercise the option within thirty days after entering upon the discharge of such duties not to become a member of the System. Elected officials who are not fulltime employees and who earn nine thousand dollars annually, or less, may exercise an option not to become members of the system.