A U.S. veteran with post-traumatic stress sits in a segregated holding pen at the Cook County Jail on June 26, 2014, after he was arrested on a narcotics charge in Chicago. The Chicago complex, with more than 10,600 inmates, is one of the country's largest single-site jails. From big cities to rural counties, the nation’s 3,300 local jails have turned into treatment centers of last resort for people with serious mental illnesses, most arrested for nonviolent crimes. (Associated Press) **FILE**
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