Md. Code, Land Use § 17–302

(a) The park police:

(1) possess all the powers and authority vested by existing law in the Montgomery County and Prince George’s County police;

(2) are responsible to and under the supervision of the Commission; and

(3) shall exercise supervisory jurisdiction over the park system.

(b) The park police shall:

(1) prevent crime;

(2) apprehend criminals;

(3) enforce the criminal and motor vehicle laws of the State;

(4) enforce park regulations; and

(5) perform other related duties that the Commission imposes.