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Montana Investigates Forensic Scientist's Work Montana officials investigate dozens of old cases as part of an investigation into the work of Arnold Melnikoff, former director of the Montana State Crime Lab. Melnikoff's testimony in hundreds of trials is being questioned after a man he helped convict was exonerated by DNA evidence. NPR's Wendy Kaufman reports.

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Montana Investigates Forensic Scientist's Work

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Montana Investigates Forensic Scientist's Work

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Montana officials investigate dozens of old cases as part of an investigation into the work of Arnold Melnikoff, former director of the Montana State Crime Lab. Melnikoff's testimony in hundreds of trials is being questioned after a man he helped convict was exonerated by DNA evidence. NPR's Wendy Kaufman reports.