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Just have him stop smoking 48 hours b4 testing, and drink a shitload of water. The day of the test (2 hours before at least) take a multi-vitamin so piss isn't clear. Make sure it's not the first piss of the day - and take the sample from mid-piss. That should do it.
Or he can spend $40 for a multi-vitamin drink that tells you to drink a shotload of water b4 the test = same thing.
good luck ... smoke on
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