Janissen v The Queen

In *Janissen v The Queen*, the appellant, Janissen, appealed to the High Court of Australia against his conviction for murder. The central dispute concerned the admissibility of certain evidence obtained during a police investigation and the proper application of the law relating to self-defence.

The High Court was required to determine whether the trial judge had erred in admitting evidence that Janissen had made a prior inconsistent statement. Further, the Court had to consider whether the jury had been adequately directed on the issue of self-defence, particularly in relation to the appellant's subjective belief as to the necessity of using force.

The Court held that the prior inconsistent statement was improperly admitted because the prosecution had failed to establish the necessary foundation for its admission under the rules of evidence. Regarding self-defence, their Honours found that the jury directions were deficient. They explained that the defence of self-defence requires the accused to have a subjective belief that the use of force was necessary, and that this belief must be based on reasonable grounds. The jury must be instructed that if they find the accused held such a belief, even if mistaken, they must acquit.

The High Court allowed the appeal, quashed the conviction, and ordered a new trial.