I'd hope that would get you arrested in short order and held until you come up with a very good and verifiable explanation about where the blood came from.
Who donated the blood is important at the point of capture, where you want to analyse the blood and make sure that neither the plasma nor the cells carry anything other than benefits to the eventual recipient.
But who exactly sourced the blood should be of no concern to the agency that ends up using it, and if there is a problem the only thing they should have to go back on should be an un-identifiable serial number that they can use to report back to the collection agency to make sure they destroy the rest of the blood from that lot and mark that particular donor as un-acceptable.
What should happen beyond that is up to the local legislation, presumably the donor should be warned and the screening process should be improved so a similar thing will never happen again, if a problem with blood products is only discovered at the time of use then that's a process failure much more than a problem with that blood.
>try turning up at ha hospital with a bag of blood
I have Rhnull and that is the only way I would donate my blood, ever. My mom (who also has this type) has been looked down as a emergency bag of blood on a few occasions and living with that is terrible experience.
