Convictions for serious offences admitted as propensity evidence cannot be used to diminish the intrinsic credibility of an accused's out-of-court statements to police so as to decline to accept those statements unless supported by independent evidence. The fact that statements to police are not on oath or affirmation, while relevant to weight, does not justify a blanket requirement for independent corroboration. Where a trial judge makes an adverse credibility finding based on the source and form of statements rather than their content, and that finding infects conclusions on central issues (alibi, opportunity), the proviso cannot cure the error if the appellate court has not seen and heard the witnesses.
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