What is the primary function of the Drug Enforcement Administration (DEA)?

The primary function of the Drug Enforcement Administration (DEA) is to enforce the controlled substances laws and regulations of the United States. This involves the oversight and regulation of the manufacture, distribution, and dispensing of controlled substances. The DEA is tasked with ensuring compliance with the Controlled Substances Act (CSA) and works to prevent drug abuse and trafficking. It regulates who can possess, prescribe, and distribute controlled substances, and monitors the handling of these substances through various legal requirements and actions.

The other options do not accurately capture the responsibilities of the DEA. The agency does not engage in promoting drug sales, which would conflict with its mission to control substance abuse. Regulating medication prices falls outside its jurisdiction, as this task typically falls to different governmental and market agencies. While the DEA may provide educational resources about drug laws and regulations, training for pharmacists is not a primary function of the agency; such training is usually conducted by other organizations or educational institutions.