Political Glossary

Schedule I Controlled Substance

A Schedule I controlled substance is the most restrictive classification under the federal Controlled Substances Act of 1970, reserved for drugs the government deems to have a high potential for abuse and no currently accepted medical use. Marijuana, heroin and LSD are all currently listed in this category.

Courts
Updated Jun 16, 2026
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In plain English
The government's strictest drug category.

It's the federal government's strictest drug category, meant for substances officials say are highly addictive and have no approved medical purpose.

Simple example
Because marijuana is a Schedule I drug, it remains illegal under federal law even in states like Colorado or California where recreational use is legal under state law.
Why it matters
What the term actually changes.
Shapes legal access

A drug's schedule determines whether it can be prescribed, researched, sold or taxed under federal law, directly affecting patients, businesses and consumers.

Drives state-federal conflict

Marijuana's Schedule I status means state-legal cannabis businesses still face federal banking restrictions, tax penalties and possible prosecution.

How it works
The mechanics, in practice.
Set by statute and agency

Congress established the five schedules in 1970, and the Drug Enforcement Administration, with input from the Food and Drug Administration, can add, remove or reclassify substances.

Rescheduling process

Changing a drug's schedule requires a formal rulemaking process including scientific review, public comment and final agency action, as seen in the DEA's 2024 proposal to move marijuana to Schedule III.

You’ve learned the term. Now vote.
Should marijuana be legalized at the federal level?
Live results — 119 voters
Yes — fully legalize, regulate, and tax marijuana like alcohol24%
Yes — but only reschedule it and let states decide retail policy16%
No — but decriminalize possession and expand medical access27%
No — keep current federal prohibition in place34%
See how 119 Americans voted
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