It's hard to know what happens behind the prison's walls.
A trial starting this week offers a rare window into the workings of the typically opaque private-prison industry, which is due for a big boost under Donald Trump.
Several stabbings reportedly happened in quick succession while inmates at Oklahoma's Cimaron Correctional Facility were being let out into an exercise yard.
A private prison in Kingman, Arizona, remains on lockdown after two days of rioting that left separate housing units damaged and several guards injured.
The melee is the latest in a string of recent uprisings at lucrative federally contracted private prison facilities used to house undocumented immigrants.