Drug Enforcement Administration (DEA)A subsidiary agency of the DOJ, the DEA’s mission “is to enforce the controlled substances laws and regulations of the United States...and to recommend and support non-enforcement programs aimed at reducing the availability of illicit controlled substances on the domestic and international markets.” To accomplish these ends, the DEA investigates and prepares for prosecution violations of controlled substances laws and regulations, and works with other federal, state, and local law enforcement agencies.