A discount of 25% for assistance to authorities may be inadequate where the assistance is extensive, valuable, and given at significant personal risk, even in the context of a very serious drug importation offence. However, the head sentence may be maintained where any lesser sentence would affront community standards. A non-parole period of 75% of the head sentence requires justification by reference to circumstances not already accounted for in the head sentence, and the usual ratio remains approximately 60% to 66⅔%.
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