When you donate blood, no matter who you are or how you answer the questionnaire, your blood is still screened for certain blood borne pathogens including HIV.
https://www.redcrossblood.org/biomedical-services/blood-diagnostic-testing/blood-testing.html
Each and every time I’ve donated blood (which I do a couple of times a year) I have to answer a lengthy questionnaire. But at the end of the day, the answers I put down are voluntary. It is not as if a background check is performed to confirm my answers are truthful.
https://www.redcrossblood.org/donate-blood/how-to-donate/eligibility-requirements/eligibility-criteria-alphabetical.html
the problem was that back when, they weren’t screening for aids- and i don’t really wanna risk a mistake in screening of known aids patients who give blood- aids is forever- and it’s deadly-