N.J. Stat. § 2C:33-19
No person enrolled as a student of an elementary or secondary school, knowingly and without the express written permission of the school board, its delegated authority, or any school principal, shall bring or possess any remotely activated paging device on any property used for school purposes, at any time and regardless of whether school is in session or other persons are present. A violation of this section shall be a disorderly persons offense. No permission to bring or possess any remotely activated paging device on school property shall be granted unless and until a student shall have established to the satisfaction of the school authorities a reasonable basis for the possession of the device on school property.
This section shall not apply to any student who is an active member in good standing of a volunteer fire company or first aid, ambulance or rescue squad provided that (1) the student is required to respond to an emergency and (2) a copy of the statement by the chief executive officer of the volunteer fire company or first aid, ambulance or rescue squad authorizing the possession of the paging device is in the possession of the student at all times while that student is in possession of the remotely activated paging device.
N.J.S. § 2C:33-19