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 THC at 0.4 mg per container. That narrows the market for products that rely on intoxicating hemp extracts and may shift demand toward products that can meet the limit