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Secondary DNA transfer by working gloves
Laura Otten1, Sabrina Banken1, Marianne Schürenkamp1
1Institute of Legal Medicine, University of Münster, Röntgenstraße 23, 48149 Münster, Germany.
Forensic Science International. Genetics
|August 26, 2019
Summary
Investigating the shedder status, this study found that "good shedders" deposit more DNA, increasing the likelihood of secondary DNA transfer. This confirms innocent individuals' DNA may be found at crime scenes, even when gloves are worn.
Area of Science:
- Forensic Science
- Genetics
Background:
- Highly sensitive STR profiling is standard in forensic analysis.
- Focus is shifting to DNA transfer mechanisms rather than source identification.
- Secondary DNA transfer via gloves is a key consideration in burglary cases.
Purpose of the Study:
- To investigate the influence of "shedder status" on secondary DNA transfer.
- To determine if shedder status affects DNA deposition on gloves and tools.
- To assess the implications for DNA evidence in criminal investigations.
Main Methods:
- Determined shedder status (good vs. bad) for 40 participants.
- Simulated a house move (P1) and burglary (P2) using gloves.
- Collected DNA samples from gloves (primary transfer) and a screwdriver (secondary transfer).
- Performed full DNA analysis on all samples.
Main Results:
- Good shedders deposited significantly more DNA than bad shedders on gloves.
- Secondary DNA transfer from P1 to the screwdriver was observed in 6/19 cases.
- All positive secondary transfer cases involved a good shedder as P1.
- No significant difference in allele deposition when participants shared the same shedder status.
Conclusions:
- Individual shedder status significantly impacts the extent of DNA transfer.
- Confirms the possibility of innocent individuals' DNA profiles being found on objects they did not directly handle.
- Highlights the importance of considering shedder status in evaluating secondary DNA transfer evidence.
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