Many questions. I assume you are talking about an American High School. There have been cases where the school board tried to test the entire population. That one was a no go. There is a precedent for testing all participants in additional activties, band, sports, debate. Test results? well the problem with results is there is no degrees, the most common tests (urine, hair follicles, blood, oral swabs) can say Yes / NO if you have consumed recently. Definination of recently? 4-12 weeks depending on the individual metabolism and the amount consumed. I went 89 days without smoking to get a clean sample. Good luck Under 18? you have no rights for all practical purposes you are your parents property. Until you have been emancipated you don't count sorry that's the American way Best suggestion is to keep it out of the school area, not the lockers, not the parking lot,on school property you are screwed. Ah the freedom of Amerikkka , sorry America
the doctor