In a first-degree murder prosecution, the Crown brought a Mohan application seeking to qualify a forensic psychiatrist as an expert to give opinion evidence regarding automatism.
The defence argued that the proposed expert’s methodology lacked reliability and that prior judicial criticism of his opinions should preclude qualification.
The court reviewed the admissibility criteria for expert evidence set out in R. v. Mohan, including relevance, necessity, absence of an exclusionary rule, and proper qualification.
While acknowledging some concerns about the expert’s prior reports and methodology, the court found that he possessed sufficient expertise in forensic psychiatry and that automatism is primarily a legal concept closely related to dissociative states recognized in psychiatry.
The expert was therefore qualified to give opinion evidence in forensic psychiatry, including on the issue of automatism.