Protecting the fire scene and delaying overhaul operations should be performed when which condition is met?

• A. Origin cannot be accurately determined
• B. The fire is fully extinguished
• C. The scene is hazardous to investigators
• D. The owner requests a quick overhaul

Answer: (A)

Preserving evidence at the scene for later origin-and-cause determination is the key idea. When investigators cannot accurately identify where the fire started, any disturbance during overhaul can erase or contaminate clues—burn patterns, ignition sources, or residues—that are crucial to understanding what happened. So, protecting the scene and delaying overhaul gives investigators the best chance to determine the origin and cause. To implement this, secure a perimeter, keep unnecessary personnel out, avoid moving burned debris, and coordinate with investigators on when and how to conduct overhaul without compromising evidence. If the origin can be determined or safety requires proceeding, overhaul can move forward, but the priority remains safeguarding the scene when origin is uncertain.