New Jersey Statutes Title 48. Public Utilities 48 § 2-35

If a person subpoenaed to attend before the board or a member thereof fails to obey the command of the subpoena without reasonable cause, or if a person in attendance before the board or a member thereof refuses without lawful cause to be examined or to answer a legal or pertinent question, or to produce a book or paper, when ordered so to do by the board or a member thereof, the board or the member may apply to the Superior Court or any judge thereof, upon proof by affidavit of the facts, for an order returnable in not less than 2 nor more than 10 days, directing such person to show cause before the court or judge why he should not comply with the subpoena or order of the board.

Upon the return of the order the court or judge before whom the matter shall come on for hearing shall examine under oath such person whose testimony may be relevant 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 comply with the subpoena or the order of the board, the court or judge may order such person to comply forthwith with the subpoena or order. Any failure to obey the order of the court or judge may be punished by the court or judge as a contempt of the Superior Court.