No, they will not test for THC. Also, 3 weeks you will be fine.
FakeBoobsRule Reviewed by FakeBoobsRule on . Donating blood at school I was planning on donating blood at my schools blood drive on monday but I relized that during the blood screening process they might check for THC. Does anyone know if they do? If so, the last I smoked was 3 weeks ago, would I be clean? Rating: 5