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Field validation of post-mortem interval estimation based on insect development. Part 2: Pre-appearance interval,
Szymon Matuszewski1, Anna Mądra-Bielewicz1
1Laboratory of Criminalistics, Adam Mickiewicz University, Al. Niepodległości 53, Poznań 61-714, Poland; Center for Advanced Technologies, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, Poznań 61-614, Poland.
Forensic Science International
|December 4, 2024
Summary
Supplementing insect age with postmortem interval (PMI) data improves accuracy. Using multiple insect evidence sources significantly enhances PMI estimation in forensic entomology.
Area of Science:
- Forensic Entomology
- Postmortem Interval Estimation
Background:
- Insect evidence is crucial for estimating postmortem interval (PMI).
- Accuracy of PMI estimation relies on insect age and other factors.
Purpose of the Study:
- To evaluate accuracy gains in PMI estimation by supplementing insect age with postmortem interval data (PAI).
- To compare the impact of expert selection of insect evidence on PMI accuracy.
- To provide baseline data on PMI estimation accuracy using various methods, insect species, and life stages.
Main Methods:
- Field experiment with nine pig carcasses in a forest habitat.
- Insects sampled monthly using standard techniques.
- Analysis of insect age and PAI to estimate PMI.
Main Results:
- Insect age alone underestimates true PMI.
- Supplementing age estimates with PAI significantly improves PMI accuracy.
- Averaging PMI across multiple insect evidence pieces is more accurate than using single evidence.
- The best multiple evidence method achieved 13-16% average PMI error.
Conclusions:
- The compound entomological method, incorporating age and PAI, is accurate for estimating PMI in mock human death cases.
- PAI is important for accurate PMI estimation.
- Utilizing multiple insect evidence sources offers substantial benefits for improving PMI accuracy.
