Simon Mareangareu v The Queen

Simon Mareangareu was convicted of common assault and attempting to pervert the course of justice by a jury in the Local Court, with the appeal brought before the Supreme Court of the Northern Territory. The appellant, a police officer, was charged with these offences following incidents where he allegedly assaulted an individual and then attempted to pervert the course of justice by providing a false statement to an investigating officer. The trial judge found the appellant guilty of both charges, but the appellant appealed against his convictions on several grounds.

The court was required to determine whether common assault could be an alternative to the charge of intentionally causing injury, whether the prosecution had improperly split its case, whether the trial judge’s comments on the facts had led to a substantial miscarriage of justice, and whether the conviction for attempting to pervert the course of justice was inconsistent with the appellant's acquittals for perjury. The court found that the prosecution had indeed split its case, and that this constituted a fundamental error in the trial. Furthermore, the court found that the trial judge’s comments on the facts had the potential to occasion a substantial miscarriage of justice. The court also found that the conviction for attempting to pervert the course of justice was inconsistent with the acquittals for perjury, as the acts alleged in the charges were not independent of each other.

The court allowed the appeal and quashed the convictions, entering judgments of acquittal on both counts. The court found that the appellant's convictions were not supported by the evidence, and that the errors in the trial process were such that they had a substantial effect on the outcome of the trial. The appellant's appeal was successful, and his convictions were quashed.