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The sensitivity of forensic tests for rape

L E Ferris1, J Sandercock

  • 1Division of Community Health, Faculty of Medicine, University of Toronto, Ontario, Canada.

Medicine and Law
|January 29, 1999
PubMed
Summary

Forensic evidence recovery in sexual assault cases is time-sensitive. No positive forensic findings do not rule out an assault, emphasizing the need for careful clinical examinations.

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Area of Science:

  • Forensic Science
  • Sexual Assault Research
  • Clinical Forensics

Background:

  • Clinical examinations are crucial for gathering forensic evidence in sexual assault cases.
  • The sensitivity and time-dependency of various forensic procedures require thorough understanding.
  • Existing literature provides insights into the effectiveness of different evidence collection methods.

Purpose of the Study:

  • To overview forensic evidence types from clinical sexual assault examinations.
  • To review the scientific literature on the sensitivity of individual forensic procedures.
  • To highlight the time-dependent nature of evidence recovery and its implications.

Main Methods:

  • Computerized literature search of MEDLINE, PsycINFO, Cinahl, and HealthStar databases (1992-1996).
  • Secondary searches included facility consultations and manual reference list reviews.
  • Analysis focused on the sensitivity and time-dependency of forensic evidence detection.

Main Results:

  • Positive evidence detection is highly time-dependent, especially for sperm and seminal products.
  • Seminal evidence recovery chances are often below 50%, decreasing significantly after 24 hours.
  • Low-sensitivity tests like pubic hair combing yield evidence in <4% of cases; invasive rectal sampling yields sperm in <2%.

Conclusions:

  • No positive forensic findings do not equate to no assault having occurred.
  • Understanding the limitations and time-sensitivity of forensic tests is vital for healthcare and legal professionals.
  • Further research is needed to improve evidence recovery and interpretation in sexual assault cases.

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