My school is going to start giving random drug tests to student athletes and people who drive to school starting next semester. I'm not an athlete, but I DO plan on driving to school next semester. Is it possible to keep a steady clean system in preparation for any drug test? I am not an everyday smoker, but I'm around people who get high every day so I am also worried about secondhand smoke showing up. I get high maybe once a week or twice a week at the very most. Sometimes I'll go two weeks without doing so. Now I assume that a cotton swab test would be easy to pass. Just wash my mouth out with peroxide (maybe on a daily basis) right? A hair follicle test, I know you can buy a shampoo. Just wash my hair out with it right after I smoke right? What I am mainly worried about is a urine test. Is there a supplement I can take that can keep my system clean on a permanent basis? What can happen if I test positive? Can they arrest me or expel me, or can they just call my parents and that be the end of it?