N.J. Stat. § 19:34-62: Prosecutor of pleas to present violations to grand jury

If the prosecutor of the pleas of the county shall be notified of any violation of any of the provisions of this title, he shall forthwith diligently inquire into the facts, and if there is reasonable ground for instituting a prosecution, such prosecutor of the pleas shall present the charge, with all the evidence which he can procure, to the grand jury of the county. Nothing herein contained shall justify any such prosecutor in counties of the first class in exercising the powers conferred upon the superintendent of elections in such counties.