Diamantopoulos v The State of Western Australia

The appellant, Diamantopoulos, appealed against his sentence for one count of property laundering and one count of possessing a trafficable quantity of methylamphetamine with intent to sell or supply. The appeal was heard by the Supreme Court of Western Australia, Court of Appeal. The key issue before the court was whether the sentencing judge had made an express error in applying the parity principle and whether the sentence imposed was manifestly excessive. The court was also required to determine if the disparity between the appellant's sentence and that of his co‑offender could be explained by the proper application of sentencing law and principles, and if the total effective sentence infringed the first limb of the totality principle.

The court began by examining the application of the parity principle, which requires sentences for similar offences to be similar, unless there are substantial and compelling circumstances that justify a difference. The court found that the sentencing judge had not made an express error in applying the parity principle. The court further considered whether the sentence of 14 years and 6 months' imprisonment was manifestly excessive. After reviewing the circumstances of the case and the seriousness of the offences, the court concluded that the sentence did not infringe the first limb of the totality principle and was not manifestly excessive. The court also found that the disparity between the appellant's sentence and that of his co‑offender could be explained by the proper application of sentencing law and principles.

The court ultimately dismissed the appeal, finding that the sentencing judge had not erred in applying the parity principle or in imposing the sentence. The court held that the sentence of 14 years and 6 months' imprisonment was appropriate given the seriousness of the offences and the circumstances of the case. The court also found that the total effective sentence did not infringe the first limb of the totality principle. The appeal was therefore dismissed, and the original sentence was upheld.