The respondent was found not criminally responsible on account of mental disorder for a 1978 murder.
After years of gradual release, he resumed substance abuse and the Review Board ordered his continued detention at a psychiatric hospital, finding him a significant threat to public safety.
The Court of Appeal set aside the Board's order as unreasonable and directed an absolute discharge, while refusing to admit fresh evidence of recent violent behaviour.
The Supreme Court of Canada allowed the Crown's appeal, holding that the Board's decision was not unreasonable given its expertise and the evidence of the respondent's resumed cocaine use.
The Court also held that the fresh evidence should have been admitted in the interests of justice.