Interlocutory appeals against rulings on the admissibility of tendency and coincidence evidence are governed by House v The King principles as confirmed in KJM v The Queen (No 2). A challenge to the trial judge's evaluation of the evidence, absent error of principle or failure to take into account relevant matters, will not succeed. Arguments regarding concoction or contamination must be raised before the trial judge and require an evidentiary basis beyond mere speculation.
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