Dearman v Dearman

This case concerned an appeal to the High Court of Australia from a decision of the Full Court of New South Wales. The original proceedings were a suit for dissolution of marriage brought by the husband (respondent in the High Court appeal) against his wife (appellant in the High Court appeal) on the grounds of adultery with a co-respondent. The trial judge, Simpson J., dismissed the petition, finding that he was not satisfied on the evidence that adultery had been committed. The Full Court of New South Wales reversed this decision, finding the inference of adultery to be irresistible.

The primary legal issue before the High Court was the standard of review applicable to an appeal from a judge of first instance who had heard oral evidence, particularly where there was a conflict of evidence. Specifically, the Court had to determine whether the Full Court was justified in reversing the findings of fact made by Simpson J.

The High Court, in allowing the appeal, held that while an appellate court must reconsider the evidence and form its own opinion, it should be reluctant to reverse a judge's findings of fact based on the credibility of witnesses, especially when the judge had the advantage of hearing them give evidence viva voce. The Court emphasised that such a reversal should only occur if the decision below was clearly wrong. In this instance, the primary judge had explicitly stated he was unable to accept the evidence of the main witnesses for the petitioner. The High Court found that there was nothing in the evidence to justify the Full Court in concluding that the trial judge was wrong in his assessment of credibility or in declining to find adultery proven on the remaining evidence. The Court noted that the Full Court's reasoning, particularly the Chief Justice's characterisation of certain circumstances as "irresistible evidence" of adultery, was overly strong and not supported by the evidence when viewed with appropriate caution. The judgment of Simpson J. was restored.