https://www.shapingfire.com/podcast-feed/episode-28-botrytis-powdery-mildew-in-scientific-detail-with-guest-kevin-mckernanbe
Probably one of the most valid sources on PM I have found.
2 points made:
A) PM is not dangerous to humans when smoked, unless some uncommon allergic reaction.
B)PM is removed from ethanol extraction process.
Regardless, once PM turns to botrytis, you really need to cut your losses.
Problem is that where there is pm, there is often botrytis. It likes to hide in the bud, and even a tiny little bit of it will cause your dab to taste like moldy mold. It is an overwhelming and immediately distinguishable flavor, and dabbing it is f'n poisonous, I'm sure. Goes in da trash.
Trying to filter all that shit and pop it off without having it properly analyzed is.. unscrupulous..
If you are going to blast mold, keep it in your head stash. Problem solved.