S.C. Code § 6-23-260
Personnel employed or appointed by a municipality to work for a joint agency shall have the same authority, rights, privileges and immunities (including coverage under the workmen's compensation laws) which the officers, agents and employees of the appointing municipality enjoy within the territory of that municipality, whether within or without the territory of the appointing municipality, when they are acting within the scope of their authority or in the course of their employment.
Personnel employed or appointed directly by a joint agency shall be qualified for participation in the South Carolina Retirement System with the same rights, privileges, obligations and responsibilities as they would have if they were employees of a municipality; provided, that personnel participating in the South Carolina Retirement Systems shall be residents of this State.
S.C. Code § 6-23-260