Where a prosecutor incorrectly tells the jury that a witness who has received a s 11 certificate under the Evidence Act 1906 (WA) is immune from prosecution, the trial judge must correct this misapprehension by directing the jury that the witness can still be prosecuted for perjury and for the offences themselves using evidence other than the protected testimony. Failure to do so constitutes a miscarriage of justice. A s 11 certificate need not always be granted in the presence of the jury; the requirement depends on the circumstances of the case.
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