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It does not say that you cannot smoke marijuana when you give blood...
http://www.chacha.com/question/how-soon-can-you-gi...
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I'm not sure if this is the case in the US, but in Canada they only test for communicable diseases, low iron levels, etc. They do not care whether or not you have taken recreational
http://wiki.answers.com/Q/When_you_give_blood_do_t...
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I get regular random tests for work and the Dr that did the last one told me it takes around 6 weeks to metabolise depending on body type and severity of usage.
http://www.answerbag.com/q_view/644606
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There will be traces in your hair for SIX month, it will be in your bloodstream for anything between 8-36 hours. Source(s): Ex-wife is a toxicologist.
http://uk.answers.yahoo.com/question/index?qid=200...
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