Not really. Anywhere will do.
I think they use a form that asks questions and they trust the people who want to give blood to be honest.
Ah! And there's the rub - so to speak. Let's say someone is NOT gay (not that there's anything wrong with that) but fill out the form checking off that they ARE gay. They'll need proof. Will pictures do?
On the flip side - if someone IS infected but says that they aren't gay? That could cause problems - no?
We need to wrest this idiotic discussion from the hands of the sodomites and put it back on a rational path. They want people to think that "gays" are being banned from donating because they are "gay", when it is merely the well-founded, rational, solidly proven risk that such behavior presents to the blood supply.