The Cook County Department of Corrections in Chicago is one of the largest single-site pre-detention facilities in the world, with an average daily population hovering around 9,000 inmates. It is estimated that 35 percent of this population is mentally ill. Now more patients than ever are being treated in jail rather than at a mental health facility. Cook County Jail has become one of the largest, if not the largest, mental health care providers in the United States.
