“Mental abnormality plus alcohol intoxication can together establish diminished responsibility.”
Dietschmann, suffering from an adjustment disorder following his aunt's death, killed a man while heavily intoxicated. He claimed diminished responsibility based on his mental condition.
Whether diminished responsibility can be established when a defendant has both a recognized mental abnormality and is voluntarily intoxicated at the time of killing.
The House of Lords allowed the appeal and substituted a conviction for manslaughter.
This important case clarified the interaction between mental abnormality and voluntary intoxication in diminished responsibility. It allows defendants with genuine mental conditions to rely on diminished responsibility even when also intoxicated, provided the abnormality substantially impaired responsibility.
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OSCOLA Citation
R v Dietschmann [2003] UKHL 10
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