I have a piss test on Wednesday and while I haven't smoked for 3.5 weeks I am a bit worried since I used it regularly and have decided to use my younger, 11 year old brothers piss. I told him I'm afraid of peeing in cups and he believed me LOL. Anyway I was wondering if they will be able to tell that I used a younger boy's piss. Also I have condoms to keep it in. How should I keep it warm? Should I just put it in my underwear? Or should I put in my underwear WITH a hand warmer? I just want to make sure I have it at the right temp!