here is what you do, have a friend that has clean piss, piss into a big cup for you. then transfur half into a ziploc bag and the other half into another ziplock bag. place each bag into another bag. about an hour before you go to the test, place a heating pad on the bags. they also check the temp of your piss to make sure you dont do this. take the heating pag off about 15 minutes before you leave for your test and tape em to the inside of your legs up by your balls or snatch. when in the room dont remove the tape from the bags, just rip a hole near the top of the bags and then squezz enough out of the bags to get you to the mark they set for you