At a scene, what key data should a forensic entomologist document?

• A. Scene accessibility
• B. Ambient temperature
• C. Collection methods
• D. Life-stage identifications

Answer: (B)

Ambient temperature is the most important data to capture at the scene because insect development is directly driven by the temperature the insects experience. Forensic PMI estimates hinge on growth rates of larvae and other colonizing insects, which are calculated using accumulated degree hours or days that depend on the temperature history around the remains. Recording the actual ambient temperature near the body (ideally with a data logger placed close to the remains and noting the readings over time) provides the essential input for these developmental models. Small differences in microclimate can shift growth rates, so capturing a representative temperature profile—often multiple readings or a logged record—improves PMI accuracy.

Other items, while useful for the investigation, do not feed directly into the temperature-driven growth calculations: scene accessibility relates to how the scene is entered and processed; collection methods describe how samples were gathered; life-stage identifications come from lab analysis of the specimens. These aspects are important, but the temperature data near the remains is the core field input that directly informs the insect-based PMI estimation.