If you just used slang I doubt there would be any way to make a case, besides not like you give receipts.
Maybe, but what prosecutor would pursue that? Hard to prove beyond reasonable doubt if all you have is a bag of oregano and the testimony of a few children that faked being high. Not a great use of time, and all for one 17 year old kid
Are you familiar with the United States? It doesn’t sound like it. In many towns, whether small cities, affluent suburbs or large cities, police, DAs and courts seemingly have nothing better to do. In the high school I attended in suburban New England they absolutely would have prosecuted a teenager who tried selling imitation drugs. I knew people who were targeted by police for years and eventually went through all sorts of police and court processes for less than 2 grams of weed.
The only way they wouldn’t have is if the family had enough money to get great lawyers, or they were related to someone who worked for the local government or school.