Does New Zealand need a special legal commission to help guard against miscarriages of justice? Philippa Tolley speaks to Chris Gallavin from the Canterbury University Law School; a senior forensic science consultant, Anna Sandiford; and a professor emeritus at the London School of Economics; Michael Zander, who 20 years ago was on a Royal Commission that recommended the setting up of The Criminal Cases Review Commission in England and Wales, set up after high profile miscarriages of justice in Britain such as the Guildford Four and the Birmingham Six convictions in relation to IRA bombings.