Police are not obliged as a matter of law to conduct an electronic record of interview with a witness who is a remand prisoner but not a person of interest or suspect. A trial judge's direction that the jury 'should use' a prison informer's evidence if convinced the informer is telling the truth, given in the context of comprehensive warnings about the informer's character and motives, does not constitute a misdirection. The failure of experienced defence counsel to call an expert DNA witness does not occasion a miscarriage of justice where there is a rational explanation for the forensic decision and the evidence would not have materially advanced the defence case.
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