S.C. Code Ann. 8-25-40(b)
Liability: Government Volunteer
An individual who volunteers with the government has the same protections against being held legally responsible as government employees.
Mileage, meal allowance and liability insurance; protection of sovereign immunity
(b) Liability insurance may be provided by the department utilizing their services both to regular-service and occasional-service volunteers to the same extent as may be provided by the department to its employees. Volunteers in state service shall enjoy the protection of sovereign immunity of the State to the same extent as employees.