N.J. Stat. § 2A:154-5
The following persons employed as full-time law enforcement officers by the Federal Government, who are empowered to effect an arrest with or without warrant for violations of the United States Code and who are authorized to carry firearms in the performance of their duties, shall be empowered to act as an officer for the arrest of offenders against the laws of this State where the person reasonably believes that a crime of the first, second or third degree is or is about to be committed or attempted in his presence:
Federal Bureau of Investigation special agents;
United States Secret Service special agents;
Immigration and Naturalization Service special agents, investigators and patrol officers;
United States Marshal Service deputies;
Drug Enforcement Administration special agents;
United States Postal inspectors;
United States Postal police officers while in the performance of
their official duties;
United States Customs Service special agents, inspectors and patrol officers;
United States General Services Administration special agents;
United States Department of Agriculture special agents;
Bureau of Alcohol, Tobacco and Firearms special agents;
Internal Revenue Service special agents and inspectors;
Department of the Interior special agents, investigators, and park rangers;
Federal Reserve law enforcement officers while in the performance of their official duties; and
United States Department of Defense police officers.
N.J.S. § 2A:154-5