N.J. Stat. § 4:7-13
To make the inspections, investigations and examinations provided for in this article and to enforce the provisions of the same, the inspectors and agents of the department may enter upon lands open or inclosed, upon which such inspections, examinations or investigations are necessary, or where any nuisance as defined in section 4:7-6 of this title is maintained or charged, or into any storehouse or building containing plant material, cuttings, seeds, bulbs, tubers, trees, shrubs or vines, which they are directed or authorized by this article to inspect.
Any interference with or obstruction made to any such inspector or agent while engaged in the performance of the duties imposed by this article, shall subject the offender to punishment as a disorderly person under the general laws of this state upon a charge made against him by the inspector or agent interfered with.
N.J.S. § 4:7-13