Covered with blood, Parks got back in his car and drove straight to a nearby police station and confessed, turning himself in, stating "I think I have just killed two people.

From the doctor's evidence, it was determined that the accused was sleepwalking at the time of the incident, and that he was suffering from a disorder of sleep rather than neurological, psychiatric, or other illness.

Chief Justice Antonio Lamer held that the trial judge was correct in his analysis of the evidence and his decision not to characterize sleepwalking as a mental disorder.

[4] La Forest, writing for L'Heureux-Dubé and Gonthier JJ., agreed with Lamer in the characterization of the evidence, but looked further into the public policy of the defence.

For a person to be exempt from criminal liability under the "disease of the mind" defence they must be a "continuing danger" to the public and the condition must be an "internal cause" that stems from the accused's emotional or psychological state.