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Old, old trick. If you can, dip your finger in something like bleach and then pee down your finger.
The test will come back with nothing. However, they may make you re-test at a later date.
Also, drink a ton of coffee several hours prior to the test so that you will have to pee several times before the test. This will give your bladder a quick clean and then when you pee for the test it will be mostly water.
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