S.C. Code § 44-24-80
The certificate provided for in Section 44-24-60(A)(2) requires a law enforcement officer, preferably in civilian clothes, to take the child into custody and transport him to the hospital designated by the certification. Upon request, a law enforcement officer shall transport the child's parent, legal guardian, or other adult family member to accompany the child to the hospital. No child may be taken into custody after the expiration of three days from the date of certification. A friend or relative may transport the individual to the hospital designated in the application, if the friend or relative has read and signed a statement on the certificate which clearly states that it is the responsibility of a law enforcement officer to provide timely transportation for the patient and that the friend or relative freely chooses to assume the responsibility. A friend or relative who chooses to transport the patient is not entitled to reimbursements from the State for the cost of the transportation. No child may be subjected to mechanical restraints during transportation except upon the determination by the law enforcement officer that restraints are necessary to prevent the child's escape or harm to himself or others. An officer acting in accordance with this chapter is immune from civil liability.
S.C. Code § 44-24-80