I'm certainly no expert on the subject but from what I have read I don't think that for a pre-employment test they can look for anything besides the drugs they are testing for. I have heard of Quick Fix working for a number of people. If your nervous about using synthetic urine, or you just want to save money try using someone else's clean urine. That's what I did yesterday. I just put a friend's clean urine in a three ounce bottle that I found at Walgreens. I also sacrificed one of the cheap digital thermometers we had here at the house. I wore two pairs of long underwear, it gets quite cold here, and put the bottle right up under my scrotum. I practiced with water in the bottle as much as I possibly could. The temp seemed to stay around 96 or 97 degrees. On the way to the clinic I put the bottle on the dash of my car and blasted it with the defroster. It heats up pretty quick doing that so be careful. When it was about 101 degrees I shoved it back in my pants and went into the clinic. From what I've read most tests require the urine to be between 90 an 100 degrees. I heated it a bit above that to compensate for the bottle cooling while I sat in the waiting room. When it was my time I went into the bathroom poured it into the cup, waited a few more seconds and crammed the bottle back into my pants. The temperature was around 96. Substitution is really quite easy especially for pre-employment screening because they wont watch you. If you have any more questions let me know. Sorry if I seem to have left out any details I have to run, but I'll be back to check this thread soon. There is a ton of information out there about substituting urine if your willing to look. Just remember it's much easier than you think and be sure to PRACTICE!!!