I don't entirely agree with your irony (unless - and I've only seen this on TV... in fact I think only in the simpsons - do blood doners get paid in the US?) C

I don't entirely agree with your irony (unless - and I've only seen this on TV... in fact I think only in the simpsons - do blood doners get paid in the US?) Certainly in the UK, where there is no benefit for giving blood, I can only assume that those who lie about it are doing so because they too know (or 100% believe, possibly incorrectly) that they are clean, and they don't want what they see as pointless policy to prevent them from helping others. Here's the problem with just saying "are you clean?" You could be in a long-term committed monogamous man-man relationship, and therefore believe you are completely safe. However, the fact that you trust your partner not to cheat on you does not mean that health authorities can trust him not to have cheated on you. So even if the person being asked is completely telling the truth, they might be wrong.