S.C. Code § 8-25-20
Every department is authorized to develop volunteer programs and accept the services of volunteers, including regular-service volunteers, occasional-service volunteers, or material donors, to assist in programs carried out or administered by that department.
Volunteers recruited, trained, or accepted by any department shall, to the extent of their voluntary service, be exempt from all provisions of law relating to state employment, hours of work, rate of compensation, leave time, and employee benefits. Volunteers shall comply with applicable work rules.
Every department using the services of volunteers is authorized to provide volunteers with such incidental reimbursements and as the department deems appropriate to assist volunteers in performing their duties.
S.C. Code § 8-25-20