Isn’t there a testing protocol in place? Has anyone(in recent years) received HIV+ blood?
If the answer is no, I don’t see the problem. No difference from you or I.
HIV positive blood is removed by screening assays that require an additional test to verify an HIV positive result.
This means that you get to pay for blood that can’t be used.
Additionally the screening assays can’t be made perfect. The more HIV positive blood that gets donated, the more likely that someone will get HIV positive blood, serum, cells or platelets.
It would be such a rare occurance, it will be almost impossible to tell how the victim acquired the HIV virus, leaving the family of the victim to speculate on what the victim has been doing.