When sentencing an offender who has given an undertaking to give evidence against a co-offender, the sentencing judge may evaluate the quality of the assistance the offender can provide but must not reduce the discount based on doubts about whether the undertaking will be fulfilled. The question of fulfilment is reserved for a potential Crown appeal under s 567(a)(1)(a) of the Crimes Act 1958 (Vic), which Parliament intended to be judged with the benefit of hindsight.
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