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

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 counts total THC, including THCA, and caps THC at 0.4 mg per container. That tightens the market for intoxicating products and may shift demand to THC-free inputs, backed by batch lab reports.