What primary factors must be documented in a fire investigation report?

The selection of scene measurements and photographs as the primary factors in a fire investigation report is essential because they provide concrete evidence of the conditions and layout at the scene of the fire. Accurate measurements help establish the scale of the area affected, the distance between various points of interest, and the placement of items that may be relevant to the investigation. Photographs serve as visual documentation that captures the state of the scene before any alterations can occur, preserving critical details that may be lost over time.

Including these elements in the report allows investigators to create a thorough and credible record of the scene, supporting their conclusions regarding the origin and cause of the fire. This documentation is invaluable, as it can be referenced during court proceedings or inquiries, providing a tangible basis for the findings of the investigation.

While other aspects, such as atmospheric conditions and witness statements, are important and might be included in a comprehensive report, they do not carry the same level of objective evidence and foundational importance as the measurements and photographs of the scene itself. Therefore, focusing on scene measurements and photographs ensures that the report is grounded in the physical realities of the investigation.