He was recalled on Friday night.
Reports claim prisoners are being kept locked down in their cells for up to 23 hours a day.
Benjamin Lightbody says it was a total failure by Corrections' staff.
People with brain injuries are over-represented in the justice system.
A new contract has been put in place.
The Department of Corrections says it is "unacceptable".
An independent review was set up after Christchurch-accused sent hate-filled letters.