I have feeling there could be DNA traces for JR that have come from a previous vehicle that has been forensically tested a car that accused may have had access to either personally or professionally. Fibres also may have been linked as well. JMO.
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That's a good suggestion. It would explain why they couldn't make any links in the earlier part of the investigation. I don't have any idea of the likelihood of DNA surviving for that length of time, though, plus I imagine the timeframe is another thing that could be used to challenge the veracity of that type of evidence.
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