N.J. Stat. § 4:12-14: Investigation of record of applicant or licensee

The secretary and any of his assistants may investigate, upon the complaint of any interested person, or of the secretary's own motion, the record of any applicant for or holder of a license, or any transaction involving the purchase of milk for shipment as provided in this article, and for such purpose may examine the ledgers, books of account, memoranda or other documents of any applicant or licensee and may take testimony therein under oath.

Information relative to the general business of an applicant or licensee, disclosed by such investigation and not relating to the immediate purpose thereof, shall be deemed of a confidential nature by the secretary, his assistants, representatives and employees.