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Lol, I think you may be worrying a bit too much.
It'll likely just either be a toothbrush looking instrument you put in your mouth, or a jar you urinate in, so don't worry.
If it is a hair sample-than anyone with hair slightly resembling yours will work.
Unless you have already supplied them with a sample of DNA, then they won't have anything to use as a control, now will they?
Seriously. You'll be fine. Mail-in-urinealysis happens all the time- even in the at home tests you can buy in walgreens.
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