In fire investigations, layering refers to which procedural method?

Layering in fire investigations refers to the systematic removal of debris from a scene. This method is crucial because it allows investigators to gradually expose different layers of materials that may have been present during the fire and can help in identifying the origin and cause of the fire. By removing debris layer by layer, investigators can assess the condition of materials beneath the surface, which may provide valuable evidence, such as burn patterns, fire dynamics, and the presence of ignitable liquids. Additionally, this careful approach helps preserve potential evidence and prevents contamination, leading to more accurate conclusions about the fire incident.

The other options relate to important aspects of fire investigation, but they do not encompass the specific procedural method known as layering. Analyzing chemical compositions pertains to the examination of substances involved in the fire, documenting witness statements focuses on gathering personal accounts from those who observed the incident, and mapping out potential ignition sources involves identifying factors that could have started the fire. Each plays a vital role in the overall investigation, but layering specifically addresses the tactical process of debris removal in order to accurately investigate the scene.