In Milwaukee, police say a mislabeled DNA sample made it possible for a suspected serial killer to avoid arrest for more than a decade. The man — now charged with seven murders — might have been arrested before some of the murders occurred if state officials hadn't lost his DNA sample. The error revealed a gaping hole in Wisconsin's DNA data bank and is spurring state officials to gather and verify thousands of DNA samples they thought were already in the system.
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DNA mix-up kept suspected serial killer free
