From Longman Dictionary of Contemporary Englishnarcoticsnarcotics[plural] especially American EnglishMDD strong illegal drugs such as heroin or cocaine the narcotics tradenarcotics agent (=a police officer who deals with the problems of narcotics) → narcotic
Examples from the Corpus
narcotics agent• Such figures cause narcotics agents to wring their hands.• Many of its narcotics agents may well be assisting the drug cartels and their hit squads. 