Support WBURNorth Dakota Prison Officials Think Outside The Box To Revamp Solitary ConfinementPlay07:03Download AudioCheryl CorleyJuly 31, 2018 ShareChief of Security Joe Charvat walks the halls of the state penitentiary's Behavior Intervention Unit (BIU) — the prison's name for solitary confinement. Typically there are about 20 inmates in the cells, far fewer than in previous years. (NPR)
