N.J. Stat. § 40:37-202
The commission may appoint and establish a constabulary to preserve order in the parks and parkways under its control, and to secure the enforcement of the rules and regulations passed and enacted by it, and may organize the constabulary into a police system to be known as "the park police of the county of ".
The police system shall consist of a chief and such subordinate officers as may be deemed necessary and proper for the enforcement of the rules and regulations of the commission within the parks and parkways, and the proper protection of public property therein.
The commission may establish proper rules and regulations for the appointment, control and management of the members of the constabulary, and for the securing of proper discipline and efficiency among the members thereof.
N.J.S. § 40:37-202