Independent Forensic DNA Review
Roebuck Forensics provides independent forensic science review and expert witness services for criminal lawyers across Australia and New Zealand.
When forensic findings appear “strong”, the real question is often:
What does the evidence actually support – and what does it not?
I help criminal lawyers properly interpret forensic results, identify assumptions and limitations, and translate complex technical material into clear, robust positions that can be used in advice, negotiation, committal preparation, and trial.
– DNA interpretation & likelihood ratios
– STRmix and mixture complexity
– Biological fluid testing (blood / semen / saliva)
– DNA transfer, contamination & persistence issues
– Bloodstain pattern analysis (BPA) review
– Cross-examination and trial support
If you have received a forensic report and need clarity early, I can help.
Roebuck Forensics provides independent forensic science review and expert witness services for criminal lawyers across Australia and New Zealand.
When forensic findings appear “strong”, the real question is often:
What does the evidence actually support – and what does it not?
I help criminal lawyers properly interpret forensic results, identify assumptions and limitations, and translate complex technical material into clear, robust positions that can be used in advice, negotiation, committal preparation, and trial.
– DNA interpretation & likelihood ratios
– STRmix and mixture complexity
– Biological fluid testing (blood / semen / saliva)
– DNA transfer, contamination & persistence issues
– Bloodstain pattern analysis (BPA) review
– Cross-examination and trial support
If you have received a forensic report and need clarity early, I can help.
Early, strategic advice is often informal and does not require a full report.
A Practical Approach to Forensic Evidence
Forensic science is powerful - but it is also conditional.
Laboratory results are shaped by:
- what was collected (and how)
- what was tested (and what was not)
- the propositions selected
- modelling decisions and assumptions
- limitations of detection and interpretation
A statistic can look compelling on paper while leaving key questions unanswered. In many matters, the true weakness is not the “DNA match” - it is what is being inferred from it.
Roebuck Forensics provides careful, evidence-based review that is scientifically rigorous and courtroom-usable.
DNA Interpretation and Likelihood Ratio Evidence
Independent evaluation of forensic DNA findings, including the use and limitations of likelihood ratios in criminal proceedings - with advice tailored to the issues in dispute.
Best for: briefs where DNA is relied upon as a central link in the Crown case or defence theory.
DNA Transfer, Persistence & Contamination
Where DNA is found is not the same as proving how it got there. I review whether transfer mechanisms, persistence timeframes, and contamination risks have been properly considered — and what can (and cannot) be concluded.
Best for: touch DNA, low-template results, indirect transfer scenarios, packaging/handling issues, and contested activity propositions.
STRmix and Complex DNA Mixture Analysis
Mixtures, low-level DNA, multiple contributors, and complex profiles require specialist scrutiny. I assess the interpretive approach, assumptions, propositions, and reporting framework.
Best for: contested interpretations, complex mixture statistics, and cases where the number appears “too strong” for the factual circumstances.
Biological Fluid ExaminationS (Blood / Semen / Saliva)
A sample described as “blood” or “saliva” is often based on presumptive testing, limited screening, or contextual assumption. I review the actual testing performed and what the results support.
Best for: sexual assault matters, assaults/homicides, and any case where the biological source is central to the narrative.
Bloodstain Pattern Analysis
Bloodstain pattern analysis can assist in evaluating accounts of events, positions, movement, timing and mechanisms — but it is also a discipline that requires careful limitation and transparency.
Best for: serious crime scenes, contested sequences of events, and matters involving violence where blood evidence has interpretive value.
Expert Reports, Trial Support, and Cross-Examination Assistance
Targeted forensic assistance to support your case theory and courtroom strategy. This includes identifying key concessions, limitations, and the questions that matter.
Best for: trial matters, committals, and any brief where forensic evidence will be a central battleground.
How Briefing Works
Engagements can range from targeted advice through to full expert witness reporting.
Depending on your needs, I can assist with:
- review of forensic statements and lab notes
- interpretation of results and statistics
- identification of technical and logical weaknesses
- formulation of propositions and alternative explanations
- preparation for conference, committal or trial
Why Roebuck Forensics
I have worked across every part of the forensic process — from crime scenes, to laboratory interpretation, to expert witness testimony.
My focus is not simply the presence of DNA or a statistic.
It is what the evidence can actually support — in the context of the case.
Next Step
If you’d like to discuss whether the forensic evidence in your matter warrants further review:
Professional memberships
University of Technology Sydney
Australia and New Zealand Forensic Science Society
Professional membership of the Australia and New Zealand Forensic Science Society reflects ongoing engagement with peer-reviewed scientific standards and the practical requirements of presenting forensic evidence within Australian and New Zealand courts.
Australian Academy of Forensic Sciences
Chartered Society of Forensic Sciences
International Association of Bloodstain Pattern Analysts
Professional membership of the International Association of Bloodstain Pattern Analysts reflects engagement with internationally recognised standards and best practice in the evaluation and communication of bloodstain pattern evidence for the courts.
International Society of Forensic Genetics
Membership of the International Society of Forensic Genetics supports independent forensic practice through continued engagement with international standards in forensic genetics and the effective communication of DNA evidence in criminal proceedings.