nark - Wiktionary, the free dictionary nark (third-person singular simple present narks, present participle narking, simple past and past participle narked) (transitive, intransitive, slang) To serve or behave as a spy or informer; to tattle
Urban Dictionary: Nark 1: To be a nark is to be someone that will report any misbehaving to a higher authority like the police, parents and teachers 2: To nark, or to nark someone out is the action of reporting the misbehavior; also called narking
NARK II Presumptive Narcotics Test Pouches by Sirchie Sirchie's NARK® drug identification pouches can presumptively identify several families of substances that could be abused drugs Each of the tests is comprised of one or more chemical reagents