There is no fixed tariff for discounts for assistance to authorities; the range of 20% to 50% for significant assistance does not constrain the sentencing discretion where the overall sentence must reflect the gravity of the offence under s 16A of the Crimes Act 1914 (Cth). Quantity of drugs imported is a relevant but not determinative factor in sentencing; selecting weight as the chief factor departs from fundamental principle. A collateral attack on a co-offender's sentence via the parity principle requires demonstrating that the co-offender's sentence was manifestly excessive.
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