Is Solitary Confinement "Cruel and Unusual"

After reading Atul Gawande's essay in the New Yorker, I'm convinced that solitary confinement is cruel and unusual. It wrecks the psyche of many prisoners and leaves them unfit to ever fully reintegrate with society:

One of the paradoxes of solitary confinement is that, as starved as people become for companionship, the experience typically leaves them unfit for social interaction. Once, Dellelo was allowed to have an in-person meeting with his lawyer, and he simply couldn't handle it. After so many months in which his primary human contact had been an occasional phone call or brief conversations with an inmate down the tier, shouted through steel doors at the top of their lungs, he found himself unable to carry on a face-to-face conversation. He had trouble following both words and hand gestures and couldn't generate them himself. When he realized this, he succumbed to a full-blown panic attack.

Craig Haney, a psychology professor at the University of California at Santa Cruz, received rare permission to study a hundred randomly selected inmates at California's Pelican Bay supermax, and noted a number of phenomena. First, after months or years of complete isolation, many prisoners "begin to lose the ability to initiate behavior of any kind--to organize their own lives around activity and purpose," he writes. "Chronic apathy, lethargy, depression, and despair often result. . . . In extreme cases, prisoners may literally stop behaving," becoming essentially catatonic.

Second, almost ninety per cent of these prisoners had difficulties with "irrational anger," compared with just three per cent of prisoners in the general population. Haney attributed this to the extreme restriction, the totality of control, and the extended absence of any opportunity for happiness or joy. Many prisoners in solitary become consumed with revenge fantasies.