I had a test done at quest not too long ago. They don't watch you pee, but they stand outside the door as you do it. They first make you empty your pockets, so if you're going with substitution or an additive, then hide it somewhere other than your pockets. Also, they do test the temp, but if you're using the pocket warmer that came with it, take it off right before you go in to take the test. When I took my test, the sample was over a hundred degrees, so they had to call the employer. It was by sheer luck that they said to send it in. Although it wouldn't realy matter because I ended up taking a better job anyway that doesn't test.