Section 15 of the Sentencing Act 1995 (WA) does not authorise a sentencing judge to take into account research or data obtained without reference to the parties and without giving them an opportunity to be heard. A sentencing judge applying the parity principle must do so by reference to the findings of fact made by the judge who sentenced the co-offender, and cannot go behind those findings. Findings as to an offender's precise position in a drug distribution hierarchy must be supported by evidence to the beyond reasonable doubt standard and cannot be based on speculation.
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