Attorneys for the city of Chicago filed an amicus brief in federal court Wednesday night, outlining opposition to a lawsuit that calls for Cook County Sheriff Thomas J. Dart to release detainees from the county jail to protect them against the spread of the novel coronavirus.Corporation Counsel Mark A. Flessner and Deputy Corporation Counsel Stephen J. Kane contend in the three-page document that releasing medically vulnerable detainees “threatens to consume the resources of the [c]ity and endanger the health of its …