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Helicopter thermal imaging for detecting insect infested cadavers.

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Summary
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Insect larval masses on decomposing bodies generate significant heat, detectable by Forward Looking Infrared (FLIR) systems for weeks post-mortem. This thermal signature aids in locating hidden human remains long after death.

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Area of Science:

  • Forensic Science
  • Entomology
  • Thermography

Background:

  • Forward Looking Infrared (FLIR) systems are used to locate living and deceased individuals by detecting thermal patterns.
  • Conventional methods are limited as body temperature approaches ambient levels within 24 hours post-mortem.
  • Decomposing remains may possess unique thermal signatures detectable beyond this initial period.

Purpose of the Study:

  • To investigate if heat generated by insect larval masses on decomposing cadavers can be detected using thermal imaging.
  • To determine the duration for which these thermal signatures remain detectable.
  • To assess the potential of this method for locating buried or hidden human remains.

Main Methods:

  • Two pig cadavers were monitored for 21 days in Germany during May and June.
  • Temperatures were recorded from cadavers, maggot masses, and surrounding environment.
  • Helicopter-based FLIR thermal imaging was conducted at various altitudes and times.
  • Insect colonization, particularly blow flies, was documented daily.

Main Results:

  • Maggot masses reached temperatures up to 25°C above ambient.
  • Cadaver surface temperatures peaked around 45°C.
  • Thermal imaging successfully detected the cadavers on 7 out of 8 flights until day 21 post-mortem.
  • Blow fly infestation was rapid, with larvae appearing by day 2.

Conclusions:

  • Insect larval masses produce significant heat detectable by FLIR systems for several weeks.
  • Thermal imaging of insect activity offers a viable method for locating decomposing human remains beyond the first 24 hours.
  • This technique enhances the capabilities of forensic investigations for locating hidden or inaccessible remains.