THCA in 2026: which states have closed the hemp loophole

The THCA flower market exists because the 2018 Farm Bill defined hemp by its delta-9 THC content — 0.3 percent or less on a dry-weight basis. Flower that meets that delta-9 threshold but is rich in THCA (which decarboxylates to delta-9 THC when heated) is, under that federal definition, hemp. Whether it remains legally salable at retail depends entirely on the state.

States that have closed the loophole

Several states have moved to a "total THC" definition that combines delta-9 and decarboxylated THCA in the threshold calculation. Under those standards, high-THCA flower fails the hemp test and is regulated as cannabis. The states that have made this move and where it is operationally effective in 2026 include California, Minnesota, and Florida, with several others in active enforcement transitions.

States where the loophole remains operational

A larger number of states continue to apply the federal delta-9-only definition at retail, which leaves THCA flower legally salable. Operators in those states should still maintain certificates of analysis from accredited labs documenting compliance with the delta-9 threshold, and should expect periodic enforcement scrutiny.

The federal variable

Farm Bill reauthorization has now been kicked into continuing-resolution territory more than once. When Congress next opens the bill, the cannabinoid definitions are an active negotiation. The realistic outcomes range from preserving the current framework to a total-THC redefinition that would dismantle the national THCA market overnight.