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What a Time Since Intercourse Evaluation Actually Assesses

• Whether sperm cells are present or absent
• The number of sperm cells observed on the swab
• Whether intact spermatozoa, heads only, or degraded forms are identified
• The anatomical location of recovery (vaginal, anal, external)
• The timing and method of sample collection
• Relevant contextual factors (washing, menstruation, condom use, repeated intercourse)

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Why This Evidence Can Be Critical in Sexual Assault Cases

• There are two clearly defined alleged windows of intercourse
• The defence case relies on earlier (or later) consensual intercourse
• The prosecution alleges no prior intercourse
• Sperm findings are being presented as strongly inculpatory
• The absence or presence of sperm is being relied upon without proper context

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A Service Many Crown Laboratories Do Not Offer

• The expertise has not been maintained or transferred
• Reporting scopes have narrowed over time
• Scientists are not trained or authorised to express opinions in this area
• Laboratories limit reporting to presence/absence findings only

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What a Proper TSI Evaluation Requires

• Detailed knowledge of sperm persistence and degradation literature
• An understanding of inter-individual variability
• Careful, case-specific contextual analysis
• Clear articulation of limitations and uncertainty
• Experience framing opinions in a way that is scientifically sound and legally appropriate
• An understanding of DNA transfer and persistence mechanisms relevant to sexual activity and post-event behaviour

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When Criminal Lawyers Should Consider an Independent Review

• Timing is central to the prosecution and defence versions
• Sperm has been detected and its significance is disputed
• The prosecution relies heavily on sperm findings
• You are told that “no expert opinion is available” without clear explanation
• Early clarification may inform plea or trial strategy

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Independent Expert Review of Time Since Intercourse Evidence

• Review of vaginal and anal swab results
• Assessment of sperm cell findings
• Comparative evaluation against competing alleged timeframes
• Clear, court-ready reporting focused on probative value
• Advice on how the findings should, and should not, be interpreted