N.J. Stat. § 43:13-37.6
The words "town employee" or "employee" as used in this act shall mean and include all employees and officers now or hereafter in service of any town in counties of the first class of this State having a population of not less than forty thousand nor more than forty-one thousand according to the census of one thousand nine hundred and thirty, and of any town board, body or commission maintained directly or indirectly, wholly or partially, out of town funds, whose term of office or position is not fixed or limited by law, not including casual or transient laborers unless such labor work is recognized as a permanent appointment by such pension fund commission, it being the intent to exclude casual or transient labor from the operation of this act. The words "town employee" or "employee" shall not be held to include office holders elected by the voters of the town nor shall it include any member of any police department or fire department whose salary or compensation is paid directly or indirectly, wholly or partially, out of the town funds. All other persons, except the casual or transient laborers hereinabove referred to, officers elected by the voters of the town and police and fire officers, now in the service of the town, not included in the foregoing provisions, shall have the privilege, in their discretion, to participate in the benefits of this act by written notice to the said pension fund commission, which notice shall be delivered within thirty days after the organization of said commission. All persons, except the casual or transient laborers hereinabove referred to, officers elected by the voters of the town and police and fire officers, hereafter entering the service of the town, not included in the foregoing provision, shall participate in the benefits of this act. The pension fund commission, in addition to the powers herein conferred, shall have power to determine what persons are included in the meaning of this act.
N.J.S. § 43:13-37.6