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

https://wiki-room.win/index.php/Could_Congress_Change_the_Hemp_Rules_Again_After_December_11%3F

The December 11 US hemp rule change counts total THC, including THCA, and caps hemp-derived THC at 0.4 mg per container. That narrows the market for intoxicating products and shifts demand toward compliant, non-intoxicating ingredients