Where an offender claims drug-induced psychosis mitigates culpability, the burden lies on the offender to establish a causal nexus between the psychosis and the criminal behaviour; voluntary ingestion of drugs does not diminish moral culpability even where the drug's effects were not well known. Hardship to a disabled family member does not constitute exceptional circumstances warranting mitigation where other family members are able to provide care. When co-offenders' sentences are reduced on appeal, justice may demand some reduction of the principal offender's sentence to maintain appropriate relativity.
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