The 2018 Farm Bill (pdf) directed USDA to establish a national regulatory framework for hemp production in the United States. USDA established the U.S. Domestic Hemp Production Program through an interim final rule. This rule outlines provisions for the USDA to approve plans submitted by States and Indian Tribes for the domestic production of hemp. It also establishes a Federal plan for producers in States or territories of Indian tribes that do not have their own USDA-approved plan.
The interim final rule governs the production of hemp under the 2018 Farm Bill. The interim final rule does not affect industrial hemp that was or is being cultivated under the 2014 Farm Bill programs. That industrial hemp remains subject to the requirements of the 2014 Farm Bill.
More information at: https://www.ams.usda.gov/rules-regulations/hemp