i've used 'em, when i was having a bunch of court dates just incase... but i never got tested... if you do decide to get one, get one that has that 300% money back garuntee... meaning if you pay 40 for the shampoo and it doesn't work you get 120 back... i don't suppose they'd really be able to stay in buisness if they didn't work... just use it exactly like it says.. oh btw, toxins don't come out of your hair like it does your piss/body.. once your hair grows out durring a period when you had it in your system, it's there... only real way around it would to be to detox yourself and shave your entire body bald lol....