Which of the following is NOT a basic function performed in fire investigations?

In fire investigations, the primary functions focus on gathering factual information related to the incident to establish the cause and origin of the fire. Photography, evidence collection, and scene searching are all critical processes that ensure a thorough examination of the fire site.

Photography serves as a vital documentation tool, capturing both the overall scene and specific details that may be crucial for analysis later on. Evidence collection involves the systematic gathering of physical evidence, such as samples of combustibles, accelerants, or any materials that may provide insight into how the fire started and spread. Scene searching is the careful examination of the area to identify potential sources of ignition, fire patterns, and any other relevant factors.

Public relations, while important for communicating findings or updates to stakeholders and the community, is not a fundamental function of fire investigations. It relates more to the management of communication rather than directly contributing to the forensic evaluation of fire scenes. Therefore, this choice stands out as not being a basic function performed in fire investigations.