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Contaminated Evidence, Unsolved Murder

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Created December 7, 2025

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Video Transcript

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Detectives rechecked everything. If Michael Henslick wasn’t in the apartment that night…

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why was his DNA all over the scene? The answer came from a detail they overlooked.

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Back in the 1980s, police collected evidence using cotton swabs handled by multiple

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officers with no gloves and no contamination protocols. DNA transfer was

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common, but no one knew it at the time. When investigators dug deeper,

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they found Henslick had been questioned in another case that same week. His DNA was already

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on police equipment. That contaminated swab was later used at the murder scene. Michael Henslick’s

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DNA wasn’t there because he was the killer. It was there because police accidentally

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