N.J. Stat. § 2A:167-8
Any convict who was undergoing imprisonment in any of the penal institutions of this state and to whom was granted a license to be at large or at liberty by the court of pardons, or to whom was granted a commutation of sentence by order of the governor, shall remain subject to the security, terms, conditions and limitations, in all respects, upon which the same was granted. Any convict undergoing imprisonment in any of the penal institutions of this state and to whom may be granted a commutation of sentence by order of the governor shall remain subject to the security, terms, conditions and limitations, in all respects, upon which the same is granted.
Every convict at large or at liberty under any such license or order shall continue to be in the legal custody of the warden, keeper or chief executive officer of the institution from which such convict was or may be released under such license or order, and under immediate and constant supervision of the division of parole of the department of institutions and agencies in accordance with the rules and regulations of the state parole board approved by the governor, and until the expiration of the maximum term of the sentence imposed upon such person for the crime for which he or she was committed.
Every convict at large or at liberty under any such license or order shall be liable to be taken at any time and returned to the place of punishment to which he or she was originally sentenced, as hereinafter provided.
N.J.S. § 2A:167-8