A trial judge is not required to give a special warning about the credibility of prosecution witnesses of bad character where the matters affecting their credibility — including criminal records, drug involvement, and self-interest — are obvious to the jury from the evidence and the way the case was conducted. The duty to warn arises only where the experience of trial judges reveals a danger to the fair trial process which the jury may not appreciate without judicial assistance. The question is not governed by Evidence Act 1906 (WA), s 50, which deals only with corroboration warnings.
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