Where an offender's mental illness renders the custodial experience more harsh, this factor is relevant to the assessment of the total sentence and should not be confined to the non-parole period. Taking mental illness into account for both the total sentence (harshness of custody) and the non-parole period (need for supervised parole for treatment compliance) does not constitute double counting. In parity cases, mental illness rendering custody more onerous for one co-offender may warrant a lesser sentence even where culpability for the offence is equal.
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