N.J. Stat. § 13:1D-46
The department may enter any industrial facility for the purpose of obtaining information concerning the industrial facility's pollution prevention practices, reviewing a pollution prevention plan, ascertaining the quality of any work performed in accordance with this act or rules or regulations adopted pursuant thereto, or ascertaining compliance with a facility-wide permit or the provisions of this act or any rule or regulation adopted pursuant thereto. Any information relating to a trade secret obtained in the course of implementing or enforcing the provisions of this act shall be kept confidential and shall be inadmissible as evidence in any court or in any other proceeding in such a manner so as to protect the confidentiality of the information.
N.J.S. § 13:1D-46