Kent Roach, a law professor at the University of Toronto, profiles dozens of cases of wrongful conviction in his new book, Wrongfully Convicted: Guilty Pleas, Imagined Crimes, and What Canada Must Do to Safeguard Justice. He talks about the steps being taken by the Canadian government to address miscarriages of justice. We also hear from Maria Shepherd, who was wrongfully convicted after the death of her stepdaughter in 1992, and acquitted in 2016.