Palmer v Superintendent Auckland Maximum Security Prison - [1991] 3 NZLR 315

Administrative law — Judicial review — Habeas corpus — Prisoner's eligibility for parole altered by amendment to Criminal Justice Act — Whether alteration to eligibility for parole was a variation of penalty — Whether penal statute was being given retrospective effect — New Zealand Bill of Rights Act 1990, s 25(g) - Criminal Justice Act 1985, ss 4, 78, 80, 81 and 93.