I am not a processor, but I grow for one and work closely with them and I do know plants. My processor packages a CBD isolate made from hemp. From what I understand, hemp does have some THC and upon extraction it exceeds the federally allowed level. This requires post processing to remove all THC. The end product is 0% THC and 50.5% CBD. I assume it could be diluted further, if 25% is desired.
While I think it is possible to find plant genetics that produce no THC whatsoever, the reality is that it is not consistent enough to satisfy the federal laws on THC here in the USA. I think post processing would be easier in the long run, particularly, if there are legal reasons for those low THC percentages.
I have also talked with several hemp breeders about seed, and they tell me there are no guarantees when it comes to passing inspection for THC below 0.3% here in the USA. I would just have to rely on the previous inspection that the line has passed.
Then I read articles like this one and ask, “why?”