N.J. Stat. § 2A:67-12
Upon the issuance of a writ by any court of competent jurisdiction of the United States or of another state, requiring the production before it of any prisoner or inmate of a penal or correctional institution in the state of New Jersey, as a witness in a criminal case or for prosecution as a defendant charged with crime, the keeper or person in charge of such institution, with the consent and approval of the attorney general, upon such conditions as the attorney general shall prescribe, shall produce or cause to be produced the inmate or prisoner according to the requirements of said writ. The attorney general shall require the return of the prisoner or inmate to the institution from which taken, immediately upon the conclusion of such prosecution or testimony, and shall require the authorities of the demanding jurisdiction to pay or indemnify the keeper or person in charge of such institution for all expenses incurred. He shall decline to honor such writs when in his opinion the same would not be in the furtherance of justice.
N.J.S. § 2A:67-12