Do they ask if you smoke weed? If they do, you should either say "yes" or don't donate. This plasma is going to go into someone's body, so you should be honest about any questions they ask you. Don't try to trick them and hope not to get "caught" --- there are probably medical reasons for any questions they ask you.

If they aren't asking about weed, then I doubt they are going to test for it, and even if they did, I don't think they would make a legal issue out of it.
dragonrider Reviewed by dragonrider on . Plasma Donations Would THC or any other cannabis byproduct show up in plasma? Rating: 5