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New oral cut-off time limits in NSW
Maria Nittis1, Michele Franco2, Clint Cochrane3
1Forensic Medical Unit, Western Sydney Local Health District, Blacktown Hospital, Marcel Crescent, Blacktown, 2148, Sydney, Australia.
Journal of Forensic and Legal Medicine
|October 5, 2016
Summary
Forensic evidence collection for penile-oral assault cases has been updated. Oral swabs are no longer recommended due to low sperm recovery rates, with oral rinses and peri-oral swabs now advised for better DNA evidence.
Area of Science:
- Forensic Science
- Genetics
- Sexual Assault Investigation
Background:
- Traditional oral swabbing for penile-oral assault investigations yields suboptimal sperm and DNA recovery.
- Literature review and NSW forensic laboratory data confirm the limitations of oral swabs.
Purpose of the Study:
- To evaluate the effectiveness of traditional oral swabbing for sperm and DNA recovery in penile-oral assault cases.
- To revise forensic collection guidelines based on evidence supporting improved sample collection methods.
Main Methods:
- Analysis of 554 oral swabs collected between 2010-2015 in NSW for sperm detection.
- Comparison of sperm detection rates between oral swabs, oral rinses, and peri-oral samples.
Main Results:
- Sperm detection rates were low for oral swabs (4.2%).
- Oral rinses (16.4%) and peri-oral samples (18.3%) showed significantly higher sperm detection rates.
- Revised guidelines now recommend oral rinses and peri-oral swabs over oral swabbing.
Conclusions:
- Oral swabbing is an ineffective method for collecting forensic evidence in penile-oral assault cases.
- New guidelines prioritize oral rinses and peri-oral swabs for enhanced sperm and DNA recovery.
- Sample collection within 12-24 hours post-assault is crucial for maximizing evidence yield.
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