Section 8(5) of the Sentencing Act 1995 (WA) is mandatory: a sentencing judge must state both the fact and the extent of any reduction for an undertaking to assist law enforcement authorities. Failure to do so constitutes an error of law, though it does not necessarily require the sentence to be disturbed if the sentence is otherwise within range. A discount for cooperation should not be generous where the cooperation amounts to no more than giving evidence consistent with a guilty plea and video record of interview. Suspension of imprisonment for aggravated burglary, while rare, is not beyond the scope of the sentencing discretion where strong personal mitigating factors exist.
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