DENVER — Troy Anderson is a mentally ill inmate in isolation at the Colorado State Penitentiary, deemed for more than a decade too dangerous to be among other offenders.

His lawyers argue, however, that prolonged solitary confinement is contributing to a vicious cycle, making his psychiatric conditions worse and resulting in misbehavior that warrants further punishment.

Prison officials defend the practice, saying administrative segregation, which can include up to 23 hours a day alone in a concrete cell, is a fundamental part of security.

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But prisoners' rights advocates around the nation say putting mentally ill inmates in long-term solitary confinement amounts to cruel and unusual punishment, and activists are pushing court challenges to get convicts such as Anderson out of isolation.

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