Forensic entomology application in China: Four case reports.

Area of Science:

• Forensic Entomology
• Forensic Science
• Entomology

Background:

• Estimating the postmortem interval (PMI) is crucial in forensic investigations.
• Entomological data, particularly from insect activity on remains, is a common method for PMI estimation.
• Challenges exist in accurately determining PMI due to various environmental and biological factors.

Observation:

• Case 1: Maggot-based PMI estimation exceeded 68 hours for a fresh corpse, likely due to pre-death fly oviposition.
• Case 2: Dermestes maculatus (Coleoptera: Dermestidae) successfully estimated PMI on a mummified body.
• Case 3: Entomological PMI estimation conflicted with other evidence, suggesting clozapine and alcohol influenced larval development.
• Case 4: Necrophagous insects were attracted to a burned corpse in winter, enabling PMI calculation.

Findings:

• Insect colonization timing is critical for accurate PMI estimation.
• Specific insects, like Dermestes maculatus, can be reliable indicators for PMI.
• Toxicological factors and environmental conditions can significantly alter insect development rates.
• Entomological methods remain viable even on burned or winter remains.

Implications:

• Highlights the need for careful consideration of pre-death insect activity in PMI analysis.
• Demonstrates the utility of specific insect taxa in challenging forensic scenarios.
• Underscores the impact of exogenous substances on insect development and PMI accuracy.
• Reinforces the adaptability and importance of forensic entomology across diverse decomposition conditions.