N.J. Stat. § 45:21-6
Upon the owner's compliance with the requirements of sections 45:21-2 to 45:21-5 of this title, said clerk shall issue to the owner a certificate for each vehicle, which certificate shall describe the vehicle and certify that the owner thereof has filed a policy and power of attorney as required by this chapter. Said certificate shall at all times be carried in the vehicle, and no lessee or bailee shall remove, or cause or permit to be removed, said certificate therefrom. Said clerk shall revoke such certificate at any time when there is not on file with him a valid policy, in full force and effect, and a power of attorney, as required by this chapter. Upon notice of such revocation, the owner shall surrender such certificate to said clerk or to any person designated by him to receive the same, and shall cease to operate, or cause or permit to be operated, such motor vehicle.
N.J.S. § 45:21-6