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In a fatal car accident where the driver's blood is drawn to test for alcohol consumption or BAC level, should the blood evidence be thrown out if...

In a case such as this, it is likely that the evidence of the blood will be thrown out of court.  However, you can argue the issue of whether it should be.


In general, the prosecution has to be able to prove every link in the chain of custody in order to have something accepted as evidence.  In the case of a blood sample, this would mean that the prosecution would have to prove who had the blood sample at every step in the process.  The drawing of the blood is the first step in that process. Therefore, if the prosecution cannot show who drew the blood, they have not proven each link in the chain of custody.  This means that the evidence will probably be thrown out.


This leaves us with the question of whether the evidence should be thrown out.  This is more of a matter of opinion.  My own view is that the evidence should be thrown out if it casts real doubt on the validity of the sample.  Let us imagine a scenario in which Officer X can testify, saying that she saw another officer (whose name she cannot remember) draw the blood and then immediately took possession of the sample.  In such a case, I do not think the evidence should be thrown out.  The officer saw the blood being drawn and there is no question of the chain of custody after that.  In my mind, there is not a serious doubt about the validity of this evidence. On the other hand, imagine a scenario in which no one knows who drew the blood.  All they can testify to is that the blood sample was in the evidence kit after the accident.  In such a case, we have no way of knowing what happened to the sample between the time it was drawn and the time it ended up in the evidence.  There is too much chance that it could have been tampered with. In such a case, I would say the evidence should be thrown out.

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