S.C. Code Ann. § 44-11-70: Employment and powers of law enforcement officers for facilities.

The Department of Behavioral Health and Developmental Disabilities may employ law enforcement officers as may be necessary to maintain the security of state mental health facilities. The law enforcement officers must be vested with all the powers and charged with all the duties of police officers generally. They may, without warrant, arrest persons guilty of disorderly conduct or of trespass on state mental health facilities and have them tried in any court of competent jurisdiction.