Quote Originally Posted by atspace
As per an unidentified source who knows the U.S. Dept. of Transportation (DOT) well, the toilet turns blue or some other color when real urine is present in the toilet. That is why we are told not to flush.
Actually, I think your friend at the DOT is off a little. There is no magic toilet water that turns blue. The water is made blue or another color so that you can't dilute your sample with toilet water. Also, there shouldn't be a sink in the bathroom but if there is the water flow should be cut off and controlled by the collector. These are two regulations that are not always followed, like in a doctor's office that is more used to taking samples for medical testing. They also don't want you to flush so that you can't send evidence to the deep blue sea such as a condom used to sneak in a sample. Not like you couldn't just shove it in your pocket.

Sheist, i have answered the extent a collector can go through to prevent subbing. I would normally tell someone to use the search feature because I answer it all the time but I am going to add this to the sticky and then refer to it in the future. This is only for employment testing, not court ordered testing. One is asking you to empty your pockets. Another is asking you to remove outerwear such as a coat or jacket. If there is a buldge they can ask you to pat yourself down but they can't touch you or frisk you. They take the temp on the sample and it should be in the range of 90-100. If not, that sample is kept and another sample is to be collected within 3 hours and you are not allowed to leave. This second sample is then produced under observation, the collector must watch the urine leave the body and enter the cup. Both samples are then sent in for testing.