N.J. Stat. § 40A:14-177
The heads of the county offices of the several counties and the head of every department, bureau and office in the government of the various municipalities shall give a leave of absence with pay to persons in the service of the county or municipality who are duly authorized representatives of an employee organization as defined in subsection e. of section 3 of P.L. 1941, c.100 (C.34:13A-3) and affiliated with the New Jersey State Policemen's Benevolent Association, Inc., Fraternal Order of Police, Firemen's Mutual Benevolent Association, Inc. or Professional Fire Fighters Association of New Jersey to attend any State or national convention of such organization, provided, however, that no more than 10 percent of the employee organization's membership shall be permitted such a leave of absence with pay, except that no less than two and no more than 10 authorized representatives shall be entitled to such leave, unless more than 10 authorized representatives are permitted such a leave of absence pursuant to a collective bargaining agreement negotiated by the employer and the representatives of the employee organization, and for employee organizations with more than 5,000 members, a maximum of 25 authorized representatives shall be entitled to such leave.
A certificate of attendance to the State convention shall, upon request, be submitted by the representative so attending.
Leave of absence shall be for a period inclusive of the duration of the convention with a reasonable time allowed for time to travel to and from the convention, provided that such leave shall be for no more than seven days.
N.J.S. § 40A:14-177