Trace DNA analysis: do you know what your neighbour is doing? A multi-jurisdictional survey

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Trace DNA analysis is a routine but unpredictable forensic technique.
• Limited communication between Australian and New Zealand forensic labs hinders standardization.
• Varied collection and analysis methods impact DNA profile recovery.

Purpose of the Study:

• To benchmark current trace DNA analysis practices in Australia and New Zealand.
• To identify factors influencing the success or failure of trace DNA analysis.
• To inform training programs, research directions, and promote a collective approach.

Main Methods:

• A survey was distributed to crime scene officers, DNA scientists, and managers.
• Surveys were sent to forensic organizations across Australian jurisdictions and New Zealand.
• Data collected covered sampling, extraction, amplification, analysis, contamination prevention, training, and success rates.

Main Results:

• Significant issues identified in results collation, hindering inter-jurisdictional comparison.
• Widespread lack of refresher training and proficiency testing noted.
• No standardized initial training courses were found.

Conclusions:

• A collective approach to training and methodology is essential for trace DNA analysis.
• Improved communication between forensic organizations is critical for establishing best practices.
• A cohesive, pan-jurisdictional strategy is recommended for consistent and reliable trace DNA profiling.