71 Pa. Stat. § 1791.1
Other than as provided in section 1 hereof, the head of each administrative department having under its jurisdiction any building or installation owned by the Commonwealth, or any building or installation, for the protection of which the administrative department is responsible, shall certify to the Governor the names of employes of such administrative department who shall act as police officers at such buildings or installations. If the Governor shall approve the persons designated, he shall issue to each a commission under which each employe shall have and exercise full power to make arrests without warrant for all violations of law which they may witness upon any part of the premises of any such building or installation as aforesaid, and to serve and execute warrants issued by the proper local authorities for any violation of law committed thereon or thereat. For such purposes and generally on the premises of such building or installation, the persons so commissioned shall have all the powers and prerogatives conferred by law upon constables of the Commonwealth.
71 P.S. § 1791.1