No touching. No human contact. The hidden toll on jail inmates who spend months or years alone in a 7x9 foot cell

Robert Downey and Rachel McAdams

Actor Robert Downey Jr., right, and actress Rachel McAdams, promote their new film "Sherlock Holmes" at the Comic-Con International 2009 convention held in San Diego Friday, July 24, 2009.
Denis Poroy / Associated Press
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