N.J. Stat. § 48:4-2.1b
The commission may, in conjunction with any program of self-inspection established to ensure compliance with regulations adopted under section 90 of P.L. 1962, c.198 (C.48:4-2.1a), and at the request of any owner or operator of a motor vehicle required to be self-inspected, authorize commission personnel to conduct vehicle emission tests and brake tests. The commission may adopt regulations setting the amount of and providing for the charging and collecting of a fee for each vehicle emission test and each brake test conducted pursuant to this section, which fee shall be in an amount necessary to cover only the actual costs of the program.
Any inspection conducted pursuant to this section relating to emissions from a motor vehicle powered with diesel fuel that is also subject to the provisions of P.L. 1995, c.157 (C.39:8-59 et al.) shall be conducted in accordance with the provisions of that act.
N.J.S. § 48:4-2.1b