N.J. Stat. Ann. § 39:5B-19

For the transport of certain types and quantities of radioactive material as specified by P.L.1977, c. 233 (C. 26:2D-18 et seq.), the driver or operator of the motor vehicle shall produce the certificate of handling or certificate number when requested to do so by any State Police officer or any representative of the State Department of Environmental Protection, while in the performance of his office, and shall also produce any other documents in such manner as may be required by law so that the officer or representative may thereby determine the identity of the certificate holder.