Flies eggs: a new method for the estimation of short-term post-mortem interval?

Area of Science:

• Forensic Entomology
• Diptera, Calliphoridae

Background:

• Estimating the post-mortem interval (PMI) is crucial in forensic investigations.
• Lucilia sericata (common green bottle fly) egg-laying behavior is a key indicator for PMI estimation.

Purpose of the Study:

• To evaluate three modeling methods for estimating the egg-laying time of Lucilia sericata.
• To determine the accuracy of these models under controlled and field conditions for PMI determination.

Main Methods:

• Hatching times of Lucilia sericata eggs were measured at various constant temperatures.
• Three distinct modeling methods were employed to estimate egg-laying times.
• Models were validated using 19 fluctuating temperature profiles and field studies on mice.

Main Results:

• All three models successfully estimated the egg-laying time within a narrow window of approximately 2 hours.
• This precision in determining egg-laying time directly correlates with determining the time of death, as egg-laying occurs immediately post-mortem under favorable conditions.
• The study demonstrates the potential for using reared eggs from a corpse to establish a short PMI.

Conclusions:

• The developed models provide a reliable method for estimating Lucilia sericata egg-laying times.
• Accurate estimation of egg-laying time significantly contributes to determining a precise post-mortem interval.
• Forensic entomology, utilizing insect evidence like fly eggs, offers valuable insights into the time since death.