N.J. Stat. § 2C:36-6.3
It is an affirmative defense to any criminal action arising under chapter 36 of Title 2C of the New Jersey Statutes for possession of a hypodermic syringe or needle that the item was obtained pursuant to the authority of section 1 of P.L. 2011, c. 183(C.2C:36-6.2). The affirmative defense established herein shall be proved by the defendant by a preponderance of the evidence. It shall not be necessary for the State to negate any such fact in any criminal complaint, information, indictment, or other pleading or in any trial, hearing, or other proceeding. Nothing in this act shall be construed to limit or constrain in any way a prosecution for the possession, manufacture, or distribution of a controlled dangerous substance or for any other conduct proscribed by chapter 35 or chapter 36 of Title 2C of the New Jersey Statutes.
N.J.S. § 2C:36-6.3