What is a method used in origin determination during a fire investigation?

Witness information is a crucial method used in origin determination during a fire investigation because it can provide firsthand accounts of the events leading up to, during, and after the fire. Witnesses may have observed the fire's initial development, observed unusual behavior, or can offer insights into the activities in the vicinity before the incident occurred. This narrative can help investigators establish timelines and potential ignition sources, as well as clarify the circumstances surrounding the fire.

In contrast, while thermal conductivity measurement may assess materials' heat transfer properties, it isn't typically used directly for determining fire origin but rather for understanding fire spread and behavior. Weather conditions can influence fire behavior, but they do not directly indicate the origin of the fire itself. Similarly, while assessing the building's age may have implications on its construction techniques and potential vulnerabilities, it does not provide direct evidence about the fire's point of origin. Witness information stands out as a method that provides specific and contextual data critical for unraveling the circumstances surrounding a fire's origin.