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Related Experiment Videos

Experiences with single locus DNA probes in casework.

M Greenhalgh1, F Burridge, G Willott

  • 1Metropolitan Police Forensic Science Laboratory, London, UK.

Forensic Science International
|November 1, 1992
PubMed
Summary

DNA profiling of vaginal swabs is crucial in sexual assault cases. Over 79% of tested swabs yielded profiles distinct from the victim, aiding investigations up to 70 hours post-assault.

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Area of Science:

  • Forensic Science
  • Genetics
  • Molecular Biology

Background:

  • DNA profiling is a key tool in forensic investigations, particularly in sexual assault cases.
  • Internal vaginal swabs are a significant sample type examined in these investigations.
  • The timely analysis of biological evidence is critical for criminal justice.

Purpose of the Study:

  • To evaluate the effectiveness of DNA profiling from internal vaginal swabs in sexual assault cases.
  • To determine the success rate of obtaining DNA profiles from post-coital samples.
  • To assess the utility of DNA profiling in excluding suspects.

Main Methods:

  • DNA profiling was performed on internal vaginal swabs collected from sexual assault victims.
  • Samples were analyzed to generate DNA profiles.
  • Profiles were compared to victim DNA and suspect DNA for identification and exclusion.

Main Results:

  • DNA profiles were successfully obtained from a majority of internal vaginal swabs.
  • 79% of analyzed swabs yielded a DNA profile different from the victim's profile.
  • DNA analysis led to the exclusion of one or more suspects in 29% of cases where profiles were obtained.
  • Viable DNA results were achieved from samples collected up to 70 hours after intercourse.

Conclusions:

  • DNA profiling of internal vaginal swabs is highly effective in sexual assault investigations.
  • This method provides valuable evidence for identifying perpetrators and excluding innocent individuals.
  • The extended window for sample collection (up to 70 hours) enhances the forensic utility of vaginal swabs.

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