re: What can DNA prove in this case?

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Pretty sure they'd be looking for some part of JJ left on the alleged victim.

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Right. Maybe spit, sweat, etc.

But here is the problem - we know Jefferson was at the scene, in the bar, etc. All that DNA evidence proves is that at some point in time Jefferson was close enough to the guy that his DNA was transferred.

DNA evidence is really tricky. It doesn't really tell you anything expect location.