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

https://stephensnewop-eds.quantlynix.com/posts/what-does-thc-free-actually-mean-for-cbd-isolate-suppliers

The December 11 US hemp rule counts total THC, including THCA, and caps THC at 0.4 mg per container. It narrows demand for intoxicating hemp products and makes THC-free inputs with batch lab reports the clearest path to compliance.