The term 'Drug Buster, for short' can be summarized by two crossword solutions: Narco (5 letters) and Narc (4 letters). Narco is a shortened form of the word Narcotics Officer, which is a law enforcement officer who specializes in the investigation and enforcement of laws related to illegal drugs. Narc is a shortened form of Narcotics Agent, which is a law enforcement agent who investigates and enforces laws related to illegal drugs. Both terms refer to individuals who are involved in the prevention and prosecution of drug-related crimes.