A trial judge's premature intimation that an accused will be cross-examined at large on prior convictions under s 15 of the Evidence Act 1977 (Qld), without properly considering the exercise of the discretion, can render a trial unfair by intimidating the accused's election whether to give evidence. Where the sole identifying witness has significant credibility concerns — including prior inconsistent statements, delay in complaint, criminal history, and a motive to fabricate — a judicial warning is required even if not sought by defence counsel, and the judge must not lend authority to the witness's evidence. The distinction between 'weapon' and 'instrument' and between 'dangerous' and 'offensive' under s 339(3) of the Criminal Code (Qld) must be properly directed.
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