Why is indoor colonization different from outdoor colonization in PMI estimation?

Why is indoor colonization different from outdoor colonization in PMI estimation?

• A. Insects do not colonize indoors
• B. Indoor environments can delay or alter colonization due to restricted access, stable temperatures, and barriers, reducing accuracy unless scene-specific data are available
• C. Indoor colonization is faster and more predictable
• D. Indoor environment lacks any insects

Answer: (B)

Indoor colonization differs from outdoor colonization in PMI estimation because indoor spaces restrict insect access and create a more stable, controlled microenvironment. Doors, windows, barriers, and indoor layouts limit how and when insects can reach decomposing remains, while temperature and humidity inside tend to stay constant, which can slow initial colonization or favor different species than outdoors. This alters the typical insect succession and development timelines used to estimate PMI, so outdoor-based data may be inaccurate indoors unless you have scene-specific data or indoor development models. In practice, insects do colonize indoor scenes, so assuming no insects or a uniformly faster/ more predictable indoor process would be incorrect.

Indoor colonization differs from outdoor colonization in PMI estimation because indoor spaces restrict insect access and create a more stable, controlled microenvironment. Doors, windows, barriers, and indoor layouts limit how and when insects can reach decomposing remains, while temperature and humidity inside tend to stay constant, which can slow initial colonization or favor different species than outdoors. This alters the typical insect succession and development timelines used to estimate PMI, so outdoor-based data may be inaccurate indoors unless you have scene-specific data or indoor development models. In practice, insects do colonize indoor scenes, so assuming no insects or a uniformly faster/ more predictable indoor process would be incorrect.