N.J. Stat. § 34:1-16

No person shall obstruct, hinder or delay, or interfere with, by force or otherwise, the performance of any duty under the provisions of this title by the commissioner or by any of the deputy commissioners, inspectors or truant officers, or refuse to answer, in writing or otherwise, questions asked by such officers relating to the matters coming under the provisions of article 2 of chapter 2 (s. 34:2-2 et seq.) and article 4 of chapter 2 (s. 34:2-31 et seq.) of this title. No person shall impersonate an officer or inspector of the department or forge his certificate of authority. Any person, corporation or firm violating any of the provisions of this section shall, for each offense, be liable to a penalty of fifty dollars.