What is the recommended procedure for origin determination in fire investigations?

The recommended procedure for origin determination in fire investigations focuses on systematic and comprehensive assessments to ensure accuracy and thoroughness in identifying the cause and origin of a fire. The approach typically involves a preliminary scene assessment to initially observe and document the condition of the scene. This includes noting visible damage patterns and potential evidence, which can provide context for later analysis.

Following the initial assessment, conducting exterior and interior examinations is crucial. Each area of the scene can yield vital clues about the fire's behavior, such as burn patterns and physical alterations of materials. This phase allows investigators to gather detailed forensic evidence that aids in pinpointing the fire's origin.

Finally, fire scene reconstruction plays a key role in understanding how the fire developed and spread from its point of origin. This step integrates all collected evidence to visualize the fire's progression and verify theories regarding its cause.

By employing this methodical approach - first assessing the scene, then examining it thoroughly, and finally reconstructing the events - investigators increase the reliability of their findings and enhance the overall integrity of the investigation. This structured sequence is pivotal in ensuring that all factors contributing to the fire's origin are considered.