Trooper investigation calls other cases into question

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BURLINGTON, Vt. (WCAX) A Vermont state police sergeant is on leave. The Orleans County State's Attorney's Office says Sgt. David Roos is being investigated in connection with a report about missing evidence.

Sgt. David Roos

That office is now requiring prosecutors to turn over evidence that could exonerate people in cases Roos was involved in.

Legal expert Jerry O'Neil gave our Galen Ettlin some insight into how this case might unfold. Watch the video for the full interview.