Who enforces the Controlled Substances Act (CSA)?

The enforcement of the Controlled Substances Act (CSA) is primarily the responsibility of the Drug Enforcement Administration (DEA). The DEA is a federal agency under the Department of Justice that focuses specifically on combating drug trafficking and distribution, ensuring that controlled substances are used safely and legally. It establishes regulations for the manufacture, distribution, and prescription of controlled substances to prevent abuse and illegal distribution.

The other options, while related to law enforcement or public health, do not have the same specialized role in drug enforcement as the DEA. The Federal Bureau of Investigation primarily deals with federal crimes including terrorism and organized crime, the Department of Justice oversees the enforcement of federal laws but delegates drug enforcement tasks to the DEA, and the Food and Drug Administration regulates the safety and efficacy of drugs but is not directly involved in enforcement of controlled substances. Therefore, the DEA is specifically tasked with the enforcement of the CSA, making it the correct answer.