Which agency is responsible for enforcing all controlled substances laws in the United States?

The Drug Enforcement Administration (DEA) is the agency accountable for enforcing laws related to controlled substances in the United States. Established in 1973, the DEA focuses specifically on combating drug trafficking and drug abuse. This includes overseeing the regulation, distribution, and legal usage of controlled substances, which are drugs that are classified based on their potential for abuse, dependency, and medical use.

The role of the DEA encompasses the investigation and prosecution of drug-related offenses, making it critical in the management of the nation's drug enforcement efforts. While other agencies such as the FDA are involved in drug regulation, they do not have the same law enforcement authority. The Narcotics Control Bureau is not a recognized federal agency in the United States, and although the Department of Justice plays a broader role in enforcing federal laws, it does not solely focus on controlled substances like the DEA does. Thus, the DEA's focused mandate on controlled substances solidifies its position as the key enforcer of relevant laws across the country.