The December 11 US hemp rule change counts total THC, including THCA, and caps...

https://en.mercopress.com/2026/10/14/new-us-hemp-rules-take-effect-december-11-shifting-demand-for-south-american-exporters

The December 11 US hemp rule change counts total THC, including THCA, and caps it at 0.4 mg per container. That narrows the market for intoxicating hemp products and shifts demand toward products that can meet the limit