The parity principle does not apply to reduce an offender's sentence by reference to the sentence of another person where the offenders are not co-offenders in any relevant sense, even where they were involved in related but separate criminal conduct. A 25% discount under s 9AA of the Sentencing Act 1995 (WA) is unavailable where the offender did not plead guilty or indicate a guilty plea at the first reasonable opportunity; a 10% discount for a plea entered 11 days before trial is within the proper exercise of the sentencing discretion.
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