Blood contains DNA, right? When you donate blood you give your blood, and DNA, to the person who gets the transfusion. So if the person who got your blood and then comitted a crime where the only evidence if blood, but the blood that squirted out just so happened to be your blood, the cops would arrest you and there would be no way for you to defend yourself-your DNA was at the crime scene. Is there some way my puny mind doesn’t know about to prevent this from happening? I know that blood ‘dies’ within a few hours of being ‘born’ but if the person got out of the hospital and immediatly commited the crime, it’s possible, right?
Actually, this quetion has been answered by the Science Advisory Board: