Section 50(2)(b) of the Evidence Act 1906 (WA) positively prohibits a corroboration warning unless justified in the circumstances; the mere fact that a witness is an accomplice whose evidence is significant is insufficient to justify such a warning. Where accomplice evidence comes from a co-accused whose self-interest in inculpating the accused is obvious to the jury, no corroboration warning is required. Trial judges should avoid using the term 'corroboration' unless intending to give a full legal direction on its meaning.
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