N.J. Stat. § 48:4-28
If a person subpoenaed to attend any hearing refuses to appear, be examined or answer any question or produce any books, records, papers, vouchers, accounts and documents when ordered so to do by the Director of the Division of Motor Vehicles or his deputy, auditor or investigator designated by him to conduct such hearing, the director, such deputy, auditor or investigator, may apply to the Superior Court, or any judge thereof, who shall have the power of the court for that purpose, upon proof by affidavit of the facts, to make an order returnable not less than 2, nor more than 10 days, directing such person to show cause before the court or a judge thereof, why he should not comply with the direction or order of the director, or of the deputy, auditor or investigator so appointed by the director.
Upon the return of such order, the court or judge before whom the matter shall come, shall examine such person under oath, and such person shall be given an opportunity to be heard and if the court or judge shall determine that such person refused without legal excuse to obey the command of the subpoena, or to be examined, or to answer a question, or to produce any book, paper, voucher, record, account or document which he was ordered to answer or produce, the court or judge may order such person to comply forthwith with the subpoena or order. Any failure to obey such order of the court or judge, may be punished by the court or judge as contempt of the Superior Court.
N.J.S. § 48:4-28