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Reflected near-infrared photography: Digging deeper into post-mortem examination.

Anurag Dubey1, Raja Rupani1, Vishal Sharma1

  • 1Forensic Medicine & Toxicology Department, KGMU, India.

Journal of Forensic and Legal Medicine
|July 16, 2022
PubMed
Summary
This summary is machine-generated.

Near Infra-Red (NIR) photography excels at visualizing trace evidence and contusions during post-mortem examinations. This technique offers superior photo-documentation compared to standard visible spectrum photography for forensic investigations.

Keywords:
ContusionForensic findingsForensic photographyHoya R72NIR photographyRoad traffic accident

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Area of Science:

  • Forensic Science
  • Medical Imaging
  • Photography

Background:

  • Post-mortem examinations require accurate visualization and documentation of forensic evidence.
  • Standard photography may struggle to capture subtle or obscured evidence.
  • Near Infra-Red (NIR) photography presents a potential advancement in forensic imaging.

Purpose of the Study:

  • To evaluate the effectiveness of Near Infra-Red (NIR) photography for visualizing forensic evidence during post-mortem examinations.
  • To compare NIR photography with Human Visible Spectrum (HVS) photography in a forensic context.

Main Methods:

  • Utilized a modified Nikon D5300 DSLR with a 760nm-860nm infrared filter for NIR photography.
  • Employed a Nikon D5600 DSLR for HVS photography.
  • Examined twenty-six deceased individuals, documenting findings using both photographic techniques.

Main Results:

  • NIR photography demonstrated superior visualization of trace evidence, such as blood spots and soil particles on dark clothing.
  • External and internal post-mortem findings, including contusions and internal injuries in accident victims, were better visualized with NIR.
  • NIR photography proved effective for documenting evidence in cases of road traffic accidents, gunshots, and drowning.

Conclusions:

  • NIR photography is the optimal technique for visualizing and photo-documenting forensically relevant post-mortem findings.
  • While HVS photography provides substantial documentation, NIR photography offers enhanced visualization of trace evidence and contusions.
  • The combination of NIR photography with natural light sources (sunlight, room light) at 760nm-860nm yields the best results for forensic evidence detection.