Where an offender's mental impairment and self-induced intoxication operate concurrently at the time of offending, the mitigating effect of the mental impairment under the [name withheld] principles is reduced unless the expert evidence unequivocally establishes that the intoxication had no real independent impact on the offender's decision-making but functioned purely as a catalyst heightening the involuntary effects of the disability. Purposeful, deliberate and persistent offending conduct is a significant indicator against a finding of substantial reduction in moral culpability. Post-offence conduct demonstrating appreciation of wrongdoing is relevant to assessing whether the offender appreciated the wrongfulness of conduct at the time of offending.
The full text is available to signed-in members, including the 22 later cases that cite this judgment.