Which of the following steps is not part of determining the area of origin?

Determining the area of origin is a crucial step in fire investigations, focusing on pinpointing the specific location where a fire started. Among the steps involved, using the scientific method, assessing potential witnesses, and examining both the exterior and interior of the structure are all integral components of this process.

The scientific method allows investigators to form hypotheses and test them against physical evidence, ensuring a systematic approach to understanding the fire's origin. Assessing potential witnesses provides valuable insights and contextual information that can inform the investigation. Thoroughly examining both the exterior and interior of the structure enables investigators to identify fire patterns, damages, and potential ignition sources.

On the other hand, reviewing fire prevention records, while beneficial for understanding a building's history and compliance with safety codes, does not directly contribute to determining the immediate area of origin. Instead, it offers a broader perspective on fire prevention efforts rather than focusing on the specifics of where the fire began, making it distinct from the direct investigative steps that pinpoint the area of origin.