Libke v The Queen

The High Court of Australia heard an appeal from the Court of Appeal of the Supreme Court of Queensland concerning the conduct of a prosecutor during the cross-examination of an appellant, Justin Libke, who had been convicted of sexual offences against an intellectually impaired person. The appeal also raised questions regarding the adequacy of the trial judge's directions to the jury on the issue of consent in the context of intellectual impairment and the defence of a reasonable belief in the absence of such impairment.

The central legal issues before the High Court were whether the prosecutor's cross-examination of the appellant constituted a "miscarriage of justice" under s 668E(1) of the Criminal Code (Q), thereby warranting the quashing of the convictions. This involved an examination of the prosecutor's conduct and the role of the trial judge in managing the cross-examination, as well as the application of the proviso in such circumstances, drawing on principles established in *Weiss v The Queen*. Additionally, the Court considered whether the trial judge's directions to the jury adequately addressed the concept of "cognitive capacity to give consent" in relation to intellectual impairment and the specific defence under s 216(4) of the Criminal Code (Q) concerning a belief on reasonable grounds that the complainant was not intellectually impaired.

The majority of the High Court, comprising Gleeson CJ, Hayne and Heydon JJ, dismissed the appeal. Their Honours found that while the prosecutor's cross-examination may have been robust, it did not, in the circumstances, occasion a miscarriage of justice. They applied the principles from *Weiss v The Queen*, considering the overall fairness of the trial and whether the jury's verdict was likely to have been affected by the prosecutor's conduct. The majority concluded that the trial judge had adequately directed the jury on the relevant issues of consent, cognitive capacity, and the statutory defence, and that the jury's findings were open to them on the evidence presented. Kirby and Callinan JJ dissented, considering that the prosecutor's conduct had indeed led to a miscarriage of justice.