Well, that's what a decision by the Food and Drug Administration seems to suggest. But it's crazy, and bad public policy.
On Wednesday, the FDA reaffirmed a policy in place since 1983 that prohibits gay men from donating blood. The Red Cross and other blood groups have been criticizing the policy as "medically and scientifically unwarranted," and have been demanding that the FDA change it. But the FDA said no. Of course, that's the modus operandi for the Bush administration anyway, isn't it? They institute (or don't institute, as the case may be) lots of policies that are scientifically unsupported.
So it seems the FDA can't protect the American public from dangerous drugs and foods - and we've seen lots of examples of that recently - but they'll make damn sure no one is tainted by gay blood. Thanks, FDA! Keeping America safe... Welcome to the American Dark Ages.