N.J. Stat. § 19:32-5
Such superintendents and their assistants, in order to enforce the laws of this State regarding the conduct of elections, shall investigate all complaints relating to the registration of voters, and for that purpose the superintendents and their assistants shall have full power and authority to visit and inspect any house, dwelling, building, inn, lodging house or hotel and interrogate any inmate, house-dweller, keeper, caretaker, owner, proprietor or landlord thereof or therein as to any person or persons residing or claiming to reside therein or thereat; to inspect and copy any books, records, papers or documents relating to or affecting the elections, either general, special, primary or municipal, or the registration of voters in the custody and control of district boards, county boards, or the clerks or other officers of municipalities; to require every lodging-house keeper, landlord or proprietor to exhibit his register of lodgers therein at any time to the superintendent, his subordinates or any other person so designated by such superintendent.
Any person who neglects or refuses to furnish any information required or authorized by this title, or to exhibit the records, papers, or documents herein authorized to be inspected, or which are required to be exhibited, shall be guilty of a crime of the fourth degree.
N.J.S. § 19:32-5