“This Report focused on a subset of people in restricted housing—the 31,500 male prisoners held in administrative segregation. In terms of the demographics, 21 jurisdictions provided comparative information on general population and the administrative segregation population and, in those systems, Blacks and Hispanics were over-represented in administrative segregation. As for living conditions, the cells were small, ranging from 45 to 128 square feet, sometimes for two people. In many places, prisoners spent 23 hours in their cells on weekdays and 48 hours straight on weekends.”