R. v. C.P., 2026 ONCA 333

Crown Appeal Dismissed:

Mental Illness Evidence, Credibility Assessment, and the Limits of Appellate Review

Joseph Neuberger, Michael Bury and Diana Davison, Neuberger & Partners LLP, Criminal Lawyers Toronto

The Ontario Court of Appeal affirms an acquittal on serious sexual offences, finding that a trial judge’s concerns about a complainant’s reliability — grounded in evidence of hallucinations and delusions — did not rest on myths or stereotypes, and that the evidence was not assessed piecemeal.

Commentary  ·  May 2026  ·  Trotter, George and Copeland JJ.A.

01 • BACKGROUND

This case arose from a Crown appeal of acquittals entered by Justice Brian D. White of the Ontario Court of Justice following a ten-day trial. The respondent — identified only as C.P. due to a publication ban under s. 486.4 of the Criminal Code — was charged with multiple serious sexual offences against his biological daughter, including sexual assault, incest, sexual interference, and various human trafficking offences.

The complainant’s circumstances were especially vulnerable. She had been placed in the care of the Children’s Aid Society as a toddler, spent over a decade with adoptive parents, experienced a breakdown of that adoptive relationship, and ultimately came to live with the respondent during early adolescence. The alleged offences occurred over approximately three months when the complainant — then between 14 and 15 years of age — was living with the respondent. She was 16 at the time of trial.

The Crown’s case depended heavily on the complainant’s testimony, as independent corroborating evidence was limited. The trial judge acquitted the respondent after finding he had reasonable doubt about the complainant’s credibility and reliability.

02 • THE TRIAL JUDGE’S REASONING

Justice White’s concerns about credibility arose from material inconsistencies in the complainant’s evidence. His concerns about reliability stemmed from a more unusual source: evidence that the complainant had a documented history of experiencing hallucinations and delusions, that she had stopped taking her prescription medication during the period of the alleged offences, and that she continued to experience such episodes during that same period — confirmed by both the complainant herself and her brother.

The trial judge also considered confirmatory evidence tendered by the Crown — including the evidence of a hotel witness who observed what she perceived to be inappropriate contact between the respondent and the complainant in an elevator — but found it insufficient to overcome his concerns about the complainant’s credibility and reliability.

“It was open to the trial judge to be left with a reasonable doubt about the reliability of the complainant’s evidence based on the evidence about her experiencing hallucinations and delusions, in the context of the evidence as a whole. He did not rely on myths or stereotypes about people living with mental illness.”

— Copeland J.A., at para. 30

03 • THE CROWN’S TWO GROUNDS OF APPEAL

The Crown advanced two grounds of appeal. Writing for a unanimous panel, Copeland J.A. rejected both.

04 • ANALYSIS: GROUND ONE — MYTHS AND STEREOTYPES

The Court confirmed the well-established legal rule: it is an error of law for a trial judge to reason from the mere fact of a mental health diagnosis to a conclusion of unreliability, absent case-specific reliability concerns. That principle was not in dispute. What was in dispute was whether the trial judge had actually committed that error.

Copeland J.A. found he had not. The trial judge had correctly self-instructed on both the need to apply age-appropriate credibility criteria (per R. v. W.(R.), [1992] 2 SCR 122) and the prohibition on myth-based reasoning. More importantly, his concerns were grounded in specific, concrete evidence: the complainant’s own testimony about hallucinations and delusions during the relevant period; her brother’s corroborating observation of one such episode; and her adoptive mother’s account of years of similar episodes which, though predating the allegations, provided important context.

The Crown’s argument that the trial judge should have “siloed” the pre-existing mental health evidence from the drug-induced episodes was rejected. The Court found no rule of law requiring such compartmentalization, and noted that the evidentiary record did not actually support a clean causal distinction in any event.

On Browne v. Dunn — the rule that a witness must be questioned about defence theory or evidence — the Court was equally unpersuaded. The defence was not contradicting the complainant about whether she experienced hallucinations and delusions; it was the cause of those symptoms that differed. The defence was not obliged to cross-examine on the specific causal theory, and had in any event put to the complainant the fact that she stopped taking her medication during the relevant period.

05 • ANALYSIS: GROUND TWO — PIECEMEAL REASONING

The Court was equally dismissive of the second ground. The trial judge had explicitly self-instructed — with reference to Morin — that the reasonable doubt standard applies to the evidence as a whole, not to individual pieces. Copeland J.A. reviewed the two specific passages the Crown highlighted in oral argument and found neither demonstrated piecemeal reasoning.

On the hotel elevator witness, the trial judge had explicitly considered her evidence against the complainant’s own testimony — noting the complainant had said she and the respondent did not engage in inappropriate displays of affection in public — and found the evidence unhelpful to the Crown as a result. That is precisely the contextual analysis the law requires.

On the respondent’s silence in the face of a sexualized text message, the trial judge’s statement that guilt was “not the only reasonable inference” was read by the Crown as applying the reasonable doubt standard to a single piece of evidence. The Court of Appeal read it instead as an explanation for why the trial judge declined to treat the silence as an adoptive admission — a legally defensible conclusion consistent with the jurisprudence on adoptive admissions.

“Appellate courts must not finely parse the trial judge’s reasons in a search for error.”

— R. v. G.F., 2021 SCC 20, at para. 69, cited at para. 40

06 • SIGNIFICANCE OF THE DECISION

This decision offers several points of practical significance for criminal practitioners.

First, it clarifies the relationship between a complainant’s mental health history and reliability concerns. The prohibition on stereotyped reasoning does not insulate a complainant’s evidence from scrutiny where there is a concrete, case-specific evidentiary basis for reliability concerns. The distinction is between generalizing from a diagnosis (prohibited) and reasoning from specific evidence of symptoms relevant to the time of the alleged events (permitted).

Second, the decision reinforces the limited scope of Crown appeals from acquittals. The Crown’s right of appeal is confined to questions of law under s. 676(1)(a) of the Criminal Code. The Court’s handling of both grounds reflects a careful application of that limitation, declining to treat disagreements with the trial judge’s factual findings as errors of law.

Third, the case is a reminder of the dangers of relying on isolated passages from trial reasons in support of an appellate ground. As the Court noted, both Crown arguments depended on reading brief portions of the reasons out of context — an approach the Supreme Court cautioned against in R. v. G.F.

07 • KEY TAKEAWAYS

Case Commentary  |  R. v. C.P., 2026 ONCA 333  |  Court of Appeal for Ontario  |  Released May 11, 2026