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The Evolution of Marijuana as a Controlled Substance and the Federal-State Policy Gap

Published Apr 7, 2022Updated Mar 4, 2026

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

The Evolution of Marijuana as a Controlled Substance and the Federal-State Policy Gap — Informed