Under current federal and state law, “hemp” is generally defined as the Cannabis plant, including all derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers, whether growing or not, with a delta-9-tetrahydrocannabinol (THC) concentration of up to 0.3 percent on a dry weight basis. Since enactment of that definition in the federal 2018 Farm Bill and subsequently in 2019 Wisconsin Act 68, “hemp” is exempt from federal and state controlled substances laws that otherwise prohibit manufacture, delivery, and possession of marijuana and THC.
Recently, Sec. 781 of P.L. 119-37 modified the federal definition of “hemp” that was created in the 2018 Farm Bill to, in part, specify substances and products that are either expressly included in or excluded from that definition, and thus either exempt from or covered by federal controlled substances laws. However, such changes do not take effect until November 12, 2026. This issue brief describes the pending substantive changes to the federal definition of “hemp” and discusses the effect of those pending changes on the legality of hemp under Wisconsin law, as well as other practical effects.