By Joanna R. Lampe

Federal law generally prohibits the production, distribution, and possession of marijuana for both medical
and recreational purposes. In April 2024, news outlets reported that the Drug Enforcement Administration
(DEA) planned to change the status of marijuana under the Controlled Substances Act (CSA) by moving
it from Schedule I to the less restrictive Schedule III. Such a move would relax some controls over
marijuana but would not immediately legalize medical or recreational use of marijuana under the CSA.
Notwithstanding the strict federal control of marijuana, in recent years, many states have repealed state
law criminal prohibitions on some marijuana-related activities, and medical and recreational cannabis
businesses now operate openly in some parts of the United States.
In response to the disparity between state and federal law, Congress has enacted appropriations legislation
prohibiting the Department of Justice (DOJ) from expending appropriated funds to prevent states from
implementing their own medical marijuana laws. Federal courts have interpreted the appropriations rider
to prohibit DOJ from bringing criminal drug prosecutions against certain persons and entities involved in
the state-legal medical marijuana industry, but they have differed as to the scope of conduct the rider
shields from prosecution.
This Legal Sidebar first outlines the legal status of marijuana under federal and state law. It then discusses
the medical marijuana appropriations rider and analyzes how federal courts have interpreted the
provision. The Sidebar closes with key considerations for Congress related to the appropriations rider and
the disparity between federal and state marijuana policy more generally.
Federal and State Marijuana Regulation
The plant Cannabis sativa L. and products derived from that plant have a number of uses and may be
subject to several overlapping legal regimes. In recent years, a significant divide has developed between
federal and state marijuana laws. On the federal side, the CSA imposes stringent regulations on the
cannabis plant and many of its derivatives. Activities involving controlled substances not authorized
under the CSA are federal crimes that may give rise to large fines and significant prison sentences.
Unless an exception applies, the CSA classifies cannabis and its derivatives as marijuana. Congress
classified marijuana as a Schedule I controlled substance when it enacted the CSA, reflecting a legislative

Washington, DC: Congressional Research Service, 2024. 5p.