The farm bill allows thc testing to occur 30 days pre harvest - when many cannabinoids have not yet formed (they all begin as cbg and become cbda, thca, etc. during later growth) and showing it to be labeled hemp. Post-harvest testing is only for delta 9 thc which is what thca become when heated, but thca is not limited. You can search for high THCA products but be careful because there are lots of scammers. I can dm you some good vendors. This is kind of a short version. If you'd like to know more, just search for info on the 2018 farm bill or Rod Kight, a well-known cannabis lawyer. People sometimes call it a loophole, but it's obviously intentional. I love that this bill was written by people who wanted it legal and then Trump signed it (knowing or not knowing?). One more thing - big canna is apparently just as bad as big pharma and has begun fighting against hemp farmers/vendors.