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Army Pfc. Bradley Manning has been imprisoned in the Quantico Marine Corps Brig for nine months, suspected of giving highly classified State Department cables to the website WikiLeaks. He has not been tried, yet is kept in solitary confinement in a windowless room 23 hours a day and forced to sleep naked without pillows or blankets.

Human rights groups have condemned his treatment, and even State Department spokesman P.J. Crowley spoke out against it. Crowley has resigned, allegedly under pressure from the Obama administration. Defense officials say Manning is stripped of his clothes nightly to prevent him from committing suicide, yet his civilian lawyer says his client is at no risk.

The problem with the argument that Manning is being kept in long-term solitary confinement to prevent his suicide is that long-term solitary confinement causes suicide.

One of the most stunning statistics in criminology today is that, on average, 50% of U.S. prisoner suicides happen among the 2% to 8% of prisoners who are in solitary confinement, also known as segregation. When I tour prisons as I prepare for expert testimony in class-action lawsuits, many prisoners living in isolation tell me they despair of ever being released from solitary.

Terry A. Kupers, CNN