Expert psychological evidence on eyewitness memory contamination may be properly discounted where the expert's critical opinion is based on an incorrect factual assumption that is not supported by the evidence at trial. Where the factual foundation for the expert's opinion is undermined, the opinion loses its force. The case also illustrates that in a judge-alone trial, the appellate court will not disturb the trial judge's assessment of witness reliability where the judge has correctly identified the critical issue and carefully analysed all factors that might render the evidence unreliable.
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