Evidence of an accused's incestuous relationship with a family member of the complainant, where that relationship provides necessary context for the complainant's evidence and is relevant to opportunity and motive to fabricate, is admissible and any prejudice can be adequately addressed by judicial direction. A deliberate forensic decision not to object to such evidence, where the evidence supports the defence case on motive, precludes a finding of miscarriage of justice. Polygraph evidence remains inadmissible absent demonstration of acceptance as reliable among impartial experts within the scientific community.
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