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Virginia crime lab faces first challenge to secret DNA algorithm

A defendant in an armed-robbery case in Fairfax County is challenging a secret algorithm used by the Virginia crime lab to interpret DNA evidence. The lab could not make a conventional match because skin-cell DNA on the victim's shirt was mixed with DNA from too many people; the algorithm identified the defendant as a contributor. The defendant is seeking to scrutinise the algorithm, reportedly for the first time.

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Virginia crime lab
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