YES, if there is any drugs in the urine it will show up on a test..if your trying to get something out of your system like mary jane perhaps..drink A LOT of water..it works..get a gallon milk jug and drink as much water as you can

The mirror shines light under whatever your looking at so that you can see it, you can use a lightbulb, but the direct heat and the closeness of the heat kills the organisms that your looking at