Documentation and Safety
The Documentation and Safety domain tests whether you can preserve a scene's information while keeping everyone on it alive. Expect questions on the order of documentation, what a photo log must contain, the elements of a written site safety plan, and the standards behind both - NFPA 921 for investigation methodology and NFPA 1033 for professional qualifications, which requires documented, ongoing technical competence across the core topics.
Document before you disturb
Work in a fixed order: exterior approach and perimeter, interior overall views, mid-range views, then close-ups with a scale and an orientation reference. Photograph before you move, dig, or sweep. Log every frame with time, location, camera direction, and photographer. Notes, measured sketches, and narrated video complement photography; none replaces the others, and each layer of excavation gets its own documentation.
Plan for safety first
- Isolate utilities - electricity at the meter, gas at the service - and verify the isolation.
- Monitor the atmosphere for carbon monoxide, hydrogen cyanide, and combustible gas; HCN is a genuine hazard in fires involving modern nitrogen-containing furnishings.
- Assess structural stability after fire exposure; do not enter unsupported floors or roofs.
- Wear PPE including respiratory protection and cut-resistant gloves; expect sharps, biohazards, and asbestos in older buildings.
- Use a buddy system and a written site safety plan with an identified safety officer.
Worked example
A bedroom-and-contents fire in a 1950s dwelling. The structure is cool, but the floor is deeply charred. Before entry the investigator confirms the power is isolated at the meter, confirms the gas service is shut, and takes a four-gas reading at the doorway, recording values and time. From the doorway he shoots an overall view, then a mid-range view of the V-pattern on the wall, then a close-up of the deepest char with a scale in frame. Only then does excavation begin, photographing each layer. When a firefighter offers to move the mattress, he photographs it in place first.
Traps that cost marks
Photos without scale, orientation, or a log are close to useless in a report. Undocumented movement of contents, handing a scene to another agency without a written transfer record, and treating a cold scene as a safe scene are all recurring errors - collapse, CO, and electrical hazards persist long after flames are out.