A trial judge has jurisdiction to alter or recall a prior ruling on admissibility of evidence, whether made by the trial judge or another judge, and this jurisdiction is not conditional on a material change in evidence or circumstances. A non-expert witness may give evidence of an impression (such as whether two persons knew each other) where the underlying facts are too evanescent to be recollected or too complicated to be separately narrated. The conduct of police in failing to disclose listening device product, while falling well below acceptable standards, did not establish a miscarriage of justice where full disclosure was ultimately made before trial.
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