Michael Williams sits for a portrait in his South Side Chicago home Tuesday, July 27, 2021. Williams was behind bars for nearly a year before a judge dismissed the murder case against him in July 2021 at the request of prosecutors, who then said they had insufficient evidence. A lawsuit filed in federal court on Thursday, July 21, 2022, alleges that Chicago police misused “unreliable” gunshot detection technology and displayed tunnel vision in investigating Williams and charging him with killing a neighbor. (AP Photo/Charles Rex Arbogast) **FILE**
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