Cooper v The Queen

The appeal in Cooper v The Queen was heard by the High Court of Australia. The appellant, Cooper, was convicted of murder and sought to appeal against his conviction. The primary issues in this appeal were whether the conduct of the trial by the appellant's counsel resulted in a miscarriage of justice and whether the trial judge erred in leaving a joint criminal enterprise open to the jury and in the directions given to the jury. The appeal was dismissed, with the Court finding that there was no miscarriage of justice and that the trial judge had made errors in certain directions but that these errors did not warrant a new trial.

The court examined whether the trial counsel's failure to lead medical evidence, cross-examine witnesses on material in medical records, and call additional witnesses amounted to a miscarriage of justice. The Court found that there was no reasonable explanation for the failure to lead medical evidence and cross-examine on the medical records. However, the Court found that there was a reasonable explanation for the failure to call witnesses, and thus, there was no miscarriage of justice on that ground. The Court also found that the trial judge had wrongly left the alternative case of a joint criminal enterprise to the jury as there was no evidence to support such a case.

The Court further considered whether the trial judge erred in the directions given to the jury on self-defence and the defence of another, as well as in relation to the admission by a witness. The Court found that the trial judge had indeed erred in these directions but concluded that these errors did not amount to a miscarriage of justice and did not warrant a new trial. The Court held that the appeal against conviction should be dismissed and the original conviction upheld.