Final answer:
The Controlled Substances Act (CSA) regulates controlled substance dispensing in the United States, and the enforcement is the responsibility of the federal government.
Step-by-step explanation:
The law that regulates controlled substance dispensing in the United States is the Controlled Substances Act (CSA). It was passed by Congress in 1970 and declares drugs such as marijuana as dangerous substances. The CSA makes the sale of these substances a prosecutable act.
The enforcement of the Controlled Substances Act is the responsibility of the federal government. While the federal government relies on the help of states to enforce the CSA, the Justice Department has the right to prosecute recreational use of controlled substances, including marijuana.