Blood cells last for about a month.
Assuming that a good quantity of the person's blood is not originally his, I would guess that the DNA test would come up as inconclusive.
Perhaps (I don't know how donated blood is tracked) the authorities could seek to find the source of his transfused blood, mix it with his, and compare that way.
More likely they wouldn't use the DNA as evidence.
The chances of accidently arresting the blood donor in the first place seem very low to me.
EDIT: Did some googling, they last about 4 months, not one.
Last edited by lordjeebus; 11-16-2003 at 12:48 PM..
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