The December 11 change counts total THC, including THCA, and caps finished...

https://dantesuniquecolumn.nexorafield.com/posts/how-do-i-convince-a-us-brand-that-my-isolate-is-really-thc-free

The December 11 change counts total THC, including THCA, and caps finished products at 0.4 mg THC per container. That narrows the market for products that rely on THC content and may reduce demand for those inputs