Muller v The Queen

Muller appealed to the Supreme Court of the Northern Territory against his conviction for aggravated assault. The dispute concerned whether the trial judge had erred in law by failing to direct the jury on the defence of self-defence in circumstances where the appellant had not explicitly raised it.

The central legal issue before the Court was whether the trial judge was obliged to direct the jury on the defence of self-defence, even though the appellant had not raised it as a defence during the trial. This involved considering the circumstances in which a judge must raise a defence *sua sponte* (of their own motion) and the threshold for such an obligation.

Mildren AJ held that a trial judge is not required to direct a jury on a defence that has not been raised by the accused unless there is some evidence that, if accepted, could potentially establish the elements of that defence. In this instance, the evidence presented did not suggest that the appellant had acted in self-defence, and therefore, the trial judge was not obliged to raise the defence. The appeal was dismissed.