Prior inconsistent statements that concern the circumstances and consequences of an alleged offence (such as the manner of an assault) are relative to the subject-matter of the proceedings within s 21 of the Evidence Act 1906 (WA) and are not merely collateral, even where they cannot prove the truth of the facts stated. However, prior inconsistent statements about matters unconnected to the facts in issue (such as the complainant's conduct with a third party that has no bearing on any element of the charged offences) remain collateral and inadmissible. The bias exception to the collateral evidence rule requires evidence capable of demonstrating a 'corrupt or other wrong motive' — a general bad relationship between a complainant and a family member, without more, is insufficient. The proposition that in sexual cases the distinction between credit and facts in issue is reduced to vanishing point is not good law in Western Australia.
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