What Is a DNA Case Review?
- Review of laboratory reports and case notes
- Examination of DNA profiles and electropherograms
- Evaluation of statistical calculations and likelihood ratios
- Assessment of mixture interpretation and contributor assumptions
- Consideration of transfer, persistence, and contamination issues
- Review of reporting language and stated conclusions
Why Independent DNA Case Reviews Are Essential
- Identify overstatement or unjustified certainty
- Expose unsupported assumptions in interpretation
- Clarify the limitations of low-level and mixed DNA evidence
- Provide courts with a balanced scientific perspective
Common Situations Where DNA Case Reviews Are Critical
Mixed DNA Profiles
- Number of contributors
- Relative contribution levels
- Whether contributors were present at the same time
- Transfer mechanisms
Low-Level and Trace DNA
- More susceptible to contamination
- More vulnerable to secondary transfer
- Prone to stochastic effects and interpretational uncertainty
DNA Transfer and Activity-Level Interpretation
- Whether secondary transfer is a plausible explanation
- Whether persistence and environmental factors were considered
- Whether the DNA findings genuinely support the alleged activity
DNA Case Review vs Re-Testing: What’s the Difference?
- Interpretation of existing data
- Statistical reasoning and reporting
- Scientific context and limitations
Reviewing Probabilistic Genotyping and STRmix™ Results
- Whether the model and assumptions were appropriate
- How likelihood ratios were derived and interpreted
- Whether alternative propositions were considered
How DNA Case Reviews Assist Legal Strategy
- Inform cross-examination of forensic witnesses
- Identify points requiring clarification or challenge
- Assist with expert conferences
- Support written submissions and trial strategy
- Provide independent expert testimony where required
DNA Case Reviews in Australian Courts
- Improving transparency
- Clarifying limitations and uncertainties
- Preventing overstated or misleading conclusions
When Should a DNA Case Review Be Requested?
- DNA evidence is central to the case
- The evidence involves mixtures or trace DNA
- Transfer or contamination is a realistic issue
- Conclusions appear definitive or simplified
- The outcome may turn on interpretation rather than data