For the offence of importing a commercial quantity of methamphetamine (over 3 kilograms pure), even unusually strong rehabilitation prospects cannot justify a non-parole period as low as 31.25 per cent of the head sentence. A non-parole period of four years on a head sentence of eight years (50 per cent) was the minimum appropriate in the circumstances, which included an early guilty plea, no knowledge of quantity, a minor role, and exceptionally favourable rehabilitation evidence. The necessary deterrent and punitive effects of sentences for serious drug importation offences must be reflected in both the head sentence and the non-parole period.
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