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DNA accumulation and transfer within an operational forensic exhibit storeroom
Claire Mercer1, Duncan Taylor2, Julianne Henry2
1College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia.
Forensic Science International. Genetics
|October 24, 2022
Summary
Trace DNA contamination is a growing concern in forensic labs. This study found DNA accumulates on storeroom shelves over time, potentially impacting evidence integrity and requiring updated storage protocols.
Area of Science:
- Forensic Science
- Molecular Biology
- Laboratory Management
Background:
- Highly sensitive DNA profiling technologies increase the risk of detecting trace DNA contamination.
- Understanding DNA accumulation and transfer in forensic settings is crucial for maintaining evidence integrity.
Purpose of the Study:
- To investigate DNA accumulation on shelves in an operational forensic exhibit storeroom.
- To assess DNA transfer between exhibit packaging and forensic workspaces.
- To evaluate the adequacy of current exhibit storage procedures in light of sensitive DNA profiling.
Main Methods:
- Samples collected from cleaned storeroom shelves over 14 weeks.
- DNA profiles compared to staff elimination databases and stored exhibits.
- STRmix™ mixture-to-mixture analysis used to identify common DNA donors.
Main Results:
- Significant increase in DNA quantity and contributor number over time.
- Lower shelves showed higher numbers of DNA profile contributors.
- DNA profiles matched forensic staff, police employees, and three stored exhibits.
Conclusions:
- DNA accumulates on storeroom shelves, posing a contamination risk.
- Shelf height influences DNA accumulation patterns.
- Current storage procedures may need re-evaluation to mitigate contamination risks with advanced DNA profiling.
