Thanks for the tip but duct tape wont work on this thing. It's a patch they put on your arm. It stays on for 7 days. It detects any drug you use while you have it on. They can tell if it's been taken off and that's as good as a positive test. It's real thin and has some kinda bar code or number system on it. It's easy for them to tell if youve messed with it. When you take it off it hardly sticks at all.