QUESTION? WHEN THEY DRUG TEST YOU DO THEY STAND AND WATCH ?
There is no way to test if marjauna in your system to say If it was an hour before or days/weeks before. That answer of not doing it before isn’t helpful.
Weed use is not a problem. Just don't smoke or drink from the day before and eat a full meal before you donate.
Don't do it before your donation and don't do it for at least an hour after make sure you eat before and after and drink plenty of water the day before
Weed will lower your blood pressure and could make it so you don't pass the tests, wait til after, then you won't miss your $$
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