N.J. Stat. Ann. § 43:10-8.1

Any employee, who has heretofore withdrawn his contributions, pursuant to R.S. 43:10-8, from a county pension fund established pursuant to article 1 of chapter 10 of Title 43 of the Revised Statutes, and has thereafter reentered the fund and paid contributions to the fund, shall be entitled to pension credit for the entire period for which contributions have been paid into the fund, and the actions of the county pension commission in granting such pension credit to any employee so reentering the fund are hereby ratified, validated and confirmed.