electrongirl wrote:I thought they tested the blood before they use it anyway?
They do, but there is about a three month period before HIV can be detected after infection (I think). That's why they make you wait a year after any activities that could risk infection (like tattoos) before you can donate.
Not sure how they deal with this with organ donation. I can't recall having to answer any questions about tattoos or risky sexual activity when I signed up to be an organ donor. And you'd think if they can't detect HIV immediately after infection with blood donation they'd have the same problem with organs as well.