North Dakota prison officials think outside the box to revamp solitary confinement

Security chief Joe Charvat walks the halls of the state penitentiary's BIU.
Chief 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.