Section 34A of chapter 94C is hereby amended by adding, after subsection (e), the following subsection:-

“(f) A person acting in good faith may provide, administer, or utilize a narcotic testing product to assist another person in determining whether a narcotic or substance contains chemicals, toxic substances, or hazardous compounds. A person who, in good faith, provides, administers, or utilizes a narcotic testing product to assist another person in determining whether a narcotic or substance contains chemicals, toxic substances, or hazardous compounds shall not be charged or prosecuted for possession of a controlled substance under sections 34 or 35 if the evidence for the charge of possession of a controlled substance was gained as a result of providing, administering, or utilizing a narcotic testing  product to provide assistance to another person. Narcotic testing products shall include, but not be limited to, fentanyl test strips.”