Strong v The Queen

In *Strong v The Queen*, the High Court of Australia considered an appeal from a conviction for murder. The appellant, Strong, had been found guilty by a jury in the Supreme Court of New South Wales and subsequently appealed to the Court of Criminal Appeal of New South Wales, which dismissed his appeal. The central dispute concerned the appellant's mental state at the time of the killing and whether it negated the element of intent required for murder.

The High Court was required to determine whether the appellant's evidence of mental impairment, specifically a dissociative state, was capable of negating the *mens rea* for murder. This involved considering the application of the defence of provocation and the principles governing the assessment of intent in the context of mental disturbance. The court also had to examine the proper directions to be given to a jury regarding the relationship between mental impairment and the requisite intent for murder.

The High Court held that the evidence of dissociative state, if accepted by the jury, could indeed negate the *mens rea* for murder. The court clarified that the defence of provocation, while relevant, was not the sole avenue for an accused to raise issues of mental impairment affecting intent. The critical question for the jury was whether the appellant possessed the necessary intent to kill or cause grievous bodily harm, and evidence of a dissociative state could raise a reasonable doubt as to this intent. The court emphasised that the jury must be directed to consider all relevant evidence, including evidence of mental impairment, when assessing whether the prosecution had proven the *mens rea* beyond a reasonable doubt. The appeal was allowed, and a new trial was ordered.