It ia a urine drug screen
I would assume that uds is short for Urine drug screening. If this is the case, the best way to pass is to simply stop taking the heroin. Easier said than done, however depending on the type of heroin used, it will take anywhere from 1 to 3 days to clear the drug from the system.
With that said, I sincerely hope that you friend will go and get help sooner vs. later. I have had several friends once upon a time that picked up that habit. Half of them are now dead. It's not the drug itself that kills, it's the unpredictable nature of the drug, having no regulations as to the exact amount dispensed in addition to being socially unable to function (unless a minimum dose is used for maintenance in the same way that suboxone or methadone would be used. This is done in the UK if I'm not mistaken).
I sincerely apologize for being such a nag (cause really, you didn't ask to be lectured), nonetheless, I've seen far to many lives ruined from this to stay quiet. Good luck, and hope that this response hasn't been too irritating as it really isn't my intention.
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