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pickup
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I will. Good or bad.
If i piss positive i will contest it as a contamined sample in the lab. And hopefully it will buy me some extra time. Or a possible defense if i get fired.
That's why the 2nd sample is tested more stringently. Procedures are followed the 2nd time around to actively prevent contamination. When you give your sample and it is handled, it is done before your eyes until the two vials are sealed. If you're gonna claim contamination, that's the only time to do it.
If you could yell do over, the drug test would be worthless.