A prosecutor's comments about a prosecution witness in final address will not cause a trial to miscarry where: (a) the prosecutor does not invite the jury to reason improperly from the witness's perceived deficiencies; (b) the defence does not rely on the witness's evidence; and (c) the trial judge gives a comprehensive direction to the jury to disregard speculation about the witness's motives. The case identifies three distinguishing features from the NSW line of authority (MRW, Kennedy, Teasdale) that may render those cases inapplicable.
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