The Police Killings Were Years Ago. New Prosecutors Are Reopening Cases.

District attorneys around the country are investigating officers in cases their predecessors had handled, raising the ire of police unions that say it undermines public safety.

The attorney general of Maine declined 14 years ago to prosecute the police officer who had killed Gregori Jackson, 18, a drunk passenger who fled on foot from a routine traffic stop in the town of Waldoboro. (“Legally justified,” the attorney general ruled.)

It was nearly 11 years ago that the district attorney in Westchester County, N.Y., found no crime when an officer, claiming he was about to be run over, had fired at Danroy Henry Jr., 20. He had bumped his Nissan Altima into the officer outside a bar while police responded to an unrelated scuffle inside. (“No reasonable cause” to indict, the grand jury concluded.)

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