N.J. Stat. Ann. § 43:10-1.6

Any employee, who at the time of his entry into a county pension fund established pursuant to article 1 of chapter 10 of Title 43 of the Revised Statutes, was given credit for and paid contributions to the fund for a period of service as an employee of the State of New Jersey or of any municipality or agency, commission or board thereof in a county adopting the provisions of article 1 of chapter 10 of Title 43 of the Revised Statutes, shall be entitled to credit for the period of other governmental service just as if that period had been spent in the employment of the county, and the actions of the county pension commission in granting credit for such periods of other governmental service are hereby ratified, validated and confirmed.