Canton Confidential: The Karen Read murder trial

Coverage of the Karen Read murder trial and her allegations of a cover-up over the killing of her boyfriend, Boston Police Officer John O'Keefe.

Curated by: NBC10 Boston (831 videos)

Currently Playing: Former trooper says Mass. State Police have problem with confirmation bias

A law enforcement expert said “tunnel vision” or confirmation bias contributed to bad policing in the investigations of John O’Keefe’s and Sandra Birchmore’s deaths, and he raised similar questions related to the death of Charles Scimone.

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