S.C. Code Ann. § 23-6-187

The department may charge a witness fee of one hundred thirty dollars per hour, up to one thousand dollars per day for each trooper trained in Advanced Accident Investigation testifying in civil matters which do not involve the State as a party in interest. The fee shall be charged in addition to any court prescribed payment due as compensation or reimbursement for judicial appearances and deposited into a designated revenue account. The department is authorized to receive, expend, retain, and carry forward these funds.