New Jersey Statutes Title 43. Pensions and Retirement and Unemployment Compensation 43 § 10-1.7

a.  1 Notwithstanding the provisions of any law with respect to reinstatement to a county pension fund of State employees paid by counties of the first class having a population of less than 800,000 to the contrary, a State employee paid by a county of the first class having a population of less than 800,000 who shall have served in such employment for a period of 15 years and has completed 15 years of service for which credit has been established in the county pension fund, and who was separated voluntarily from the service, and not by removal for cause or charges of misconduct or delinquency, shall, upon reentering the employ of the State and paid by a county of the first class within 5 years after such separation, be reinstated automatically to the county pension fund; provided, however, that such employee shall not be entitled to receive credit for pension purposes for the time elapsing during such separation period.