Where evidence of uncharged sexual acts is admitted for a limited purpose (such as context) and not as propensity evidence under s 31A of the Evidence Act 1906 (WA), the trial judge must give a specific direction that the jury must not engage in propensity reasoning — that is, must not reason that the accused was the kind of person likely to have committed the charged offences. A direction that the evidence is merely 'context' or 'background' is insufficient, particularly where other aspects of the direction or the prosecutor's submissions invite the jury to use the evidence in deciding whether the charges are proved. The label 'context' covers a variety of different uses of evidence, and the permissible use must be clearly articulated.
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