N.J. Admin. Code § 2:5-6.3
When there is reason to believe that any livestock or poultry or premises is affected by a disease or agent, described at N.J.A.C. 2:2-1.1, the Department may undertake appropriate examination and testing to confirm the existence of such disease or agent, and the Department may enter any property for that purpose. Owners of livestock or poultry or premises to be examined and tested pursuant to this section, and their agents, shall grant access and provide assistance to the Department, as requested, and instructed by the Department and its representatives, including assistance by restraining, handling, and making available any animals involved until completion of the examination and testing. No person shall interfere with or otherwise obstruct any agent of the Department in the performance of their duties authorized by this section.
N.J. Admin. Code § 2:5-6.3