R.I. Gen. Laws § 32-2-11: Powers of park police.

All full-time park policemen assigned to the division of enforcement within the department of environmental management, including the chief of the division and the chief of the metropolitan park police, shall have and may exercise, on any property under the jurisdiction of the department of environmental management, with regard to the enforcement of the criminal laws and all rules and regulations of the department of environmental management, all the powers of deputy sheriffs, town police officers, and constables, provided, however, that when any person is suspected of having committed a felony, the superintendent of state police, as he or she shall so require, shall be notified.