Where a prosecutor advances theories in cross-examination and closing address that are unsupported by evidence, a general direction against speculation is insufficient; the trial judge must specifically direct the jury that those theories do not amount to evidence and must not be used as a basis for rejecting the accused's evidence. The proviso in s 30(4) of the Criminal Appeals Act 2004 (WA) cannot be applied where the case turns on credibility and the appellate court has not observed the accused give evidence.
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