What should be the top priority for investigators during an onsite fire investigation?

The top priority for investigators during an onsite fire investigation is preserving the integrity of the scene. This is crucial because the fire scene holds vital evidence that can aid in determining the cause and origin of the fire. If the scene is not preserved effectively, important physical evidence could be lost or contaminated, which may compromise the entire investigation and hinder the ability to reach an accurate conclusion.

When the integrity of the scene is maintained, it allows investigators to methodically analyze the area for signs of ignition sources, patterns of burn damage, and any materials that may have contributed to the fire. This careful preservation ensures that all evidence is collected systematically and thoroughly, which is essential for building a robust case for either civil or criminal proceedings if necessary.

While collecting evidence, interviewing witnesses, and securing the area are all important tasks, they come into play after ensuring the scene remains intact. Focusing on the preservation of the scene first establishes a solid foundation for the investigation and increases the likelihood of finding conclusive evidence regarding the fire's origin and cause.