FILE - 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)

CHICAGO (AP) — A federal lawsuit filed Thursday alleges Chicago police misused “unreliable” gunshot detection technology in investigating a grandfather from the city’s South Side and charging him with killing a neighbor. The lawsuit filed by the MacArthur Justice Center at Northwestern University’s law school seeks damages from the city on behalf of 65-year-old Michael Williams, who says he still suffers from a tremor in his hand that developed while he was locked up in jail for nearly a year. The Associated Press reported last year that a judge dismissed his case at the request of prosecutors, who said they had insufficient evidence.