The vehicles used by the state police for purposes of investigation and detective operations need not be marked as state property, and need bear only such license plates as are required on privately owned vehicles.
N.J. Stat. Ann. § 53:3-7
Markings on vehicles
Current official text: New Jersey Legislature. Digitized from the New Jersey Legislature bulk statutes download. Reproduced from public-domain New Jersey statutes; confirm against the official source for the current text. Not legal advice.