A process used for, among other things, determining levels of Δ9-tetrahydrocannabinol (THC) in cannabis by heating the cannabis to convert the THC acid (THCA) into THC. Critics of decarboxylation note that test results contain higher levels of THC and can render legally cultivated hemp unlawful.

Interim regulation of the United States Drug Enforcement Agency that took effect on August 21, 2020 and purported to clarify changes to federal law as a result of the Agriculture Improvement Act of 2018. The rule holds that all synthetic cannabinoids, and any hemp derivatives containing more than .3% Δ9-tetrahydrocannabinol (THC) are deemed marijuana for