The Waitangi Tribunal says the Crown is breaching its Treaty obligations because it hasn't slashed high reoffending rates by Maori.
The results from an inquiry are out from a claim lodged by retired senior probation officer Tom Hemopo.
The Tribunal says the difference in reoffending between Maori and non-Maori is undisputed, longstanding and substantial.
It says the Corrections Department has no specific plan or budget even though the Justice sector announced a broad target to reduce Maori reoffending.
The tribunal says at least 10-thousand Maori children are likely to have a parent in prison.