What is the primary purpose of detection in fire investigations?

The primary purpose of detection in fire investigations is to sense the existence of a fire through various methods. This involves identifying signs of combustion or heat, which can lead to an understanding of the nature and development of the fire. Detection techniques can include physical observation, the use of thermal imaging, and other methodologies to confirm whether a fire was present and to gather initial data that informs the investigation process.

Understanding the existence of a fire is vital for determining its characteristics and potential causes, allowing investigators to develop an accurate narrative of events as they unfolded. This emphasis on detection lays the groundwork for subsequent steps in the investigation, including assessing damage, determining the cause, and documenting findings. The other options focus on post-fire activities rather than the critical initial step of confirming the fire's presence.