I used a friends clean piss I put it in a 4 oz bottle with a temperature label. I had to take the test today so once i found out i called him he pissed in the 4 oz bottle. I put it in my jock strap after wiping it down with a clorox wipe I put it in the cup spot the temperature never changed after an hour took the test and now I am employed. I also bought hand warmers but i didn't need them. I wish i would have done this method a long time ago. Please use this method instead of synthetic piss.Peace im off to work.