N.J. Stat. § 19:32-4.1
On the day of every municipal, primary, general, special or annual school election the superintendent of elections in counties having a superintendent of elections or the county board of elections in all other counties shall provide to each polling place in the county sufficient numbers of a form on which voters or persons attempting to vote may register any complaint regarding the conduct of the election at the polling place where they voted or attempted to vote. In counties in which the primary language of 10% or more of the registered voters is Spanish, the form for the complaint shall appear in both English and Spanish. The form shall protect the anonymity of the complainant, if that person so wishes, and shall be accompanied by an envelope with the proper postage and the name and address of the superintendent of elections of the county or the chairman of the county board of elections, as the case may be. A complaint may be used by the superintendent of elections or any other municipal or State investigatory agency to conduct an investigation into possible violation of the State election law. Copies of the form containing the complaint shall be available from the superintendent of elections or the county board of elections, as the case may be. The original form of the complaint, or a copy, shall be kept on file with the superintendent of elections or the county board of elections, as the case may be, for two years after the election for which it was filed.
N.J.S. § 19:32-4.1