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Blood transfusion - mistaken identity?
Aight, i was discussing DNA tests with some friends, and came accross this idea, If a burgler was robbing a house and cut himself on glass, the DNA of the blood was taken and a match found, normally this would incriminate that person. What happens if that person has had a blood transfusion on the days preciding, wouldnt he have others DNA, possibly several other peoples DNA in his blood? This could lead to a case of mistaken identity and the wrong person arrested?
How long do blood cells last in a persons blood, and is this hypothetical situation possible? or have we overlooked some key factor?
thoughts anyone?
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