I am going to move this to the substance abuse forum because I do also think you'll get better replies there.
But, first, I'm going to give my reply. :)
When you're being tested for drugs, the drugs in your system have to be at a certain level. Marijuana can be out of your system, depending on the amount you smoked, within days. But, generally, it takes up to 30 days of not smoking to test clean. That is supposed to be normal for avid smokers.
How long ago was it you had smoked with your friend?
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