S.C. Code Ann. § 40-18-110: Authority and arrest powers of those licensed or registered under chapter.

A person who is registered or licensed under this chapter and who is hired or employed to provide security services on specific property is granted the authority and arrest power given to sheriff's deputies. The security officer may arrest a person violating or charged with violating a criminal statute of this State but possesses the powers of arrest only on the property on which he is employed.