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Forensic entomology and the estimation of the minimum time since death in indoor cases
Valentina Bugelli1, David Forni, Luciani Alessandro Bassi
1Dipartimento di Patologia - Unità di Medicina Legale-, Università di Pisa, via Roma 55, Pisa, 56126, Italy.
Abstract:
Eight cases that occurred indoors in which the insects played an important role in the mPMI estimation are presented. The bodies of socially isolated people and old people living alone were discovered in central Italy between June and November. mPMI ranged from a few days to several weeks. Insects were collected during the body recovery and the postmortem. Climatic data were obtained from the closest meteorological stations and from measurements performed on the site. Sarcophagidae and Calliphoridae species were present in 75% of the cases with Lucilia sericata and Chrysomya albiceps collected in 50% of the cases. Chrysomya albiceps was always found in association with Lucilia species. Scuttle flies (Phoridae) were found in 37.5% of the cases, confirming the ability of these species in indoor body colonization. We show that if sealed environment may delay, the insect arrival dirty houses may create the environment where sarcosaprophagous insects are already present.
Insights
Insects significantly aid indoor postmortem interval (PMI) estimation, especially in cases involving isolated individuals. Factors like house cleanliness influence insect colonization and PMI accuracy.
Area of Science:
- Forensic Entomology
- Postmortem Interval Estimation
- Ecological Studies
Background:
- Accurate postmortem interval (PMI) estimation is crucial in forensic investigations.
- Indoor PMI estimation presents unique challenges due to environmental variations.
- Insect activity is a key factor in determining PMI, particularly in decomposition studies.
Observation:
- Eight indoor cases in central Italy (June-November) involving socially isolated individuals were analyzed.
- Insects were collected during body recovery and postmortem examination.
- Climatic data were gathered from local meteorological stations and on-site measurements.
Findings:
- Sarcophagidae and Calliphoridae were present in 75% of cases, with Lucilia sericata and Chrysomya albiceps in 50%.
- Chrysomya albiceps consistently appeared with Lucilia species.
- Phoridae (scuttle flies) were found in 37.5% of cases, indicating indoor colonization capability.
- Dirty indoor environments may harbor sarcosaprophagous insects, potentially pre-colonizing remains.
Implications:
- Insect evidence provides valuable data for PMI estimation in indoor forensic cases.
- Understanding indoor insect colonization dynamics, including the role of Phoridae, enhances forensic analysis.
- Environmental conditions, such as house cleanliness, significantly impact insect arrival and decomposition rates, affecting PMI accuracy.
