You can buy fake powdered urine... just add water 
But if you wanna use your own urine, then stop smoking about a month in advance to be super, extra, mega safe.....
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The anti-marijuana campaign is a cancerous tissue of lies, undermining law enforcement, aggravating the drug problem, depriving the sick of needed help, and suckering well-intentioned conservatives and countless fightened parents.
-William F Buckley
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