NPR's Melissa Block profiles the New York Police Department's new cold case squad, set up this past February to investigate unsolved homicides. So far, they've closed 27 cases. Some of the work involves tracking down known fugitives, trying to figure out where they've gone. And for those cases WITHOUT a known perpetrator, the detectives start from scratch: lots of phone work, knocking on doors, digging around. The head of the unit calls it the "purest police work you can do."
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