R v Poynton (No. 3)

The case of R v Poynton (No. 3) involved the accused, who was charged with two counts of murder. The dispute centred on the appropriate trial format, given the nature of the defences raised by the accused, specifically the defence of mental illness or the partial defence of substantial impairment. The case was heard in a higher court, where the accused sought a trial by a judge alone rather than a jury. The primary legal issue before the court was whether it was in the interests of justice for the trial to proceed before a judge alone, considering the defences and the evidence presented.

The court had to determine whether the substantial impairment defence, which required assessing the credibility of the accused's account as provided to psychiatrists, constituted a quintessential jury issue. The court also needed to weigh the interests of justice, including the importance of ensuring a fair trial for the accused and the need to balance this with the gravity of the charges. The court concluded that the substantial impairment defence did indeed involve a quintessential jury issue, as it required assessing the accused's credibility and the impact of this on the determination of the defence. Consequently, the application for a trial by a judge alone was refused.

In reaching its decision, the court emphasised the importance of the jury's role in evaluating the credibility of witnesses and the accused's account, particularly in complex cases involving mental health defences. The court determined that it was not in the interests of justice to deprive the accused of the right to have their case assessed by a jury. The final orders of the court were that the application for a trial by a judge alone was dismissed, and the matter proceeded to a jury trial.