R v MCO

In the case of R v MCO, the appellant, who had been convicted by a jury of one count of incest with his stepdaughter, appealed against his conviction on several grounds. The appeal focused on the admissibility of expert evidence given by a neuropsychologist about the complainant's autism and intellectual impairment, the trial judge's direction to the jury concerning this evidence, and the trial judge's direction to the jury about certain independent evidence supporting the complainant's account. The appeal was heard in the Supreme Court of Victoria.

The primary legal issues in the appeal were whether the neuropsychologist's evidence regarding the complainant's ability to recall and give an accurate account of past events was admissible as expert evidence, and if not, whether this constituted a miscarriage of justice. Additionally, the appeal questioned whether the trial judge erred in not directing the jury that they could not use the neuropsychologist's evidence to bolster the complainant's credibility or negate any doubts about her reliability. The final issue was whether the trial judge misdirected the jury in allowing them to consider independent evidence supporting the complainant's account, which included observations of blood on a toilet seat and a bruise on the complainant's tail bone, as well as the complainant's complaint of a "sore bum".

The court found that the neuropsychologist's evidence was not admissible as it was not within the experience of ordinary persons and thus not appropriate expert evidence. Despite this, the court determined that the admission of this evidence did not result in a miscarriage of justice as the jury could have reasonably inferred the complainant's brief and lacking account from her testimony alone. Furthermore, the court concluded that the trial judge did not err in his directions to the jury regarding the neuropsychologist's evidence and the independent evidence supporting the complainant's account. Consequently, the appeal against the conviction was dismissed.

The final orders of the court were that the appeal against the conviction was dismissed, and the original conviction and sentence of the appellant remained in place.