For an appeal from an acquittal to be successful, the Supreme Court of Canada requires the Crown to show that an error in law was made during the trial and that it contributed to the verdict. It has been suggested that this test is unfairly beneficial to the prosecution. For instance, in his book "My Life in Crime and Other Academic Adventures", Martin Friedland contends that the rule should be changed so that a retrial is granted only when the error is shown to be "responsible" for the verdict, not just a factor.