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A primary duty of fire investigators is to interview witnesses. This task is essential because testimonies from individuals who may have been present during the fire can provide critical information about the events leading up to and during the incident. By gathering accounts from eyewitnesses, fire investigators can piece together a timeline, understand the circumstances surrounding the fire, and potentially identify the cause. This information is vital for determining whether the fire was accidental or intentional.

In contrast, while inspecting structures for code compliance and providing fire education programs are important roles within the fire service, they do not specifically fall under the primary responsibilities of fire investigators. Additionally, managing emergency medical services is typically associated with emergency medical personnel rather than investigators, further distinguishing the unique role that interviewing witnesses plays in the investigative process.