N.J. Stat. Ann. § 52:17B-105

Any county prosecutor may request in writing the assistance of the Attorney General in the conduct of any criminal investigation or proceeding. The Attorney General may thereafter take whatever action he deems necessary to assist the county prosecutor in the discharge of his duties. Whenever the Attorney General shall take any such action, he shall be authorized to exercise all the powers and perform all the duties which by law are conferred upon or required of the county prosecutor making such request.