Where an offender is sentenced on the basis of a misdiagnosis of their mental condition (here, drug-induced psychosis rather than schizophrenia), fresh evidence correcting that diagnosis can demonstrate that the sentencing judge was under a misapprehension as to the offender's true condition, leading to an undervaluation of Verdins considerations and rendering the sentence excessive despite no error by the sentencing judge on the evidence before him. A diagnosis of long-standing schizophrenia active at the time of offending clearly reduces moral culpability and engages Verdins principles more substantially than drug-induced psychosis.
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