The appellant, a traditional Chinese medicine practitioner, appealed his sexual assault conviction.
The appeal centered on whether the trial judge erred by introducing a new theory of liability (removal of a towel exposing genitals) late in the trial, which differed from the Crown's primary theory (vaginal examination).
The Court of Appeal found that the trial judge's introduction of this new theory, and subsequent conviction based on it, was unfair to the appellant as it constituted a drastic change made too suddenly and too late, prejudicing the defence.
The court held that while judges are not confined to parties' theories, trial fairness considerations may preclude new bases of liability inconsistent with how the case was litigated.
The appeal was allowed, the conviction quashed, and a new trial ordered.