Potier v The Queen

The applicant, Potier, was convicted of murder in the Supreme Court of New South Wales and subsequently appealed to the Court of Criminal Appeal of New South Wales. The appeal concerned the admissibility of certain evidence and the fairness of the trial.

The primary legal issue before the High Court of Australia was whether the Court of Criminal Appeal had erred in upholding the trial judge's decision to admit evidence of the applicant's prior convictions. Specifically, the court had to consider whether this evidence was relevant to the issues in the trial and whether its prejudicial effect outweighed its probative value, as per the principles governing the admission of such evidence in criminal proceedings.

Heydon J, delivering the judgment of the High Court, reasoned that the prior convictions were not relevant to any issue in the trial and were therefore inadmissible. His Honour emphasised that evidence of prior convictions is generally inadmissible unless it possesses a specific relevance to a matter in issue, such as establishing a pattern of conduct or rebutting a defence. In this instance, the evidence was admitted without sufficient justification, leading to an unfair trial. The High Court allowed the appeal, quashed the conviction, and ordered a new trial.