AdvertisementSolitary Confinement Costs $78K Per Inmate And Should Be Curbed, Critics SayFebruary 25, 2014Carrie JohnsonBill ChappellfacebookEmailThe U.S. holds more prisoners in solitary confinement than any other democratic country, according to critics of the treatment. Here, an immigrant detainee makes a call from his "segregation cell" at a detention facility in Adelanto, Calif., last November. (Getty Images)