In attempted murder cases where the accused's defence turns on a factual contention about the manner in which the act was committed (here, whether the accused knew she was using the sharp edge of a knife), the trial judge must isolate that factual issue for the jury and direct that if the accused's testimony leaves them with a reasonable doubt, the accused must be acquitted. A trial judge must not use the very facts in issue as an example when directing on the law of attempt, as this may effectively endorse the Crown case and foreclose the ultimate question for the jury.
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