re: Arse's tip of the day: if you test your DNA, don't leave chili dog napkins laying around

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How do they prove the napkin was his and not one of the dozens of others in the trash can?

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They don't have to anymore. They just needed probable cause to arrest him. It said that they swabbed him once in custody and it's still a match.

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After Westrom’s arrest this week, DNA was collected from him. It too was a match with DNA on the washcloth seized from the homicide scene, authorities said. His DNA allegedly also matched sperm on the towel and the comforter from the apartment.

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