During a jury trial for murder arising from a home invasion, the accused sought to call a cardiologist to testify that a congenital heart condition could have caused hypoxia leading to confusion and impaired cognition during the incident.
The Crown opposed the evidence, arguing it lacked relevance, necessity, and proper qualification and risked misleading the jury.
Applying the Mohan framework as refined in White Burgess and Abbey, the court held the proposed expert testimony was logically relevant, necessary to explain the accused’s serious medical condition, and within the expert’s qualifications.
The court further concluded that any limitations in the opinion affected weight rather than admissibility and that the probative value of the defence-led evidence was not substantially outweighed by prejudice.
The expert evidence was therefore admitted for consideration by the jury.