Final answer:
The preservation of the fire scene should begin with the first responding companies, and all DOAs should be considered potential crime victims. A scene becomes a crime scene if officially determined as such, not just by the Incident Commander's declaration. The use of gasoline powered equipment at a fire scene is typically prohibited to avoid contamination and safety risks.
Step-by-step explanation:
Fire Scene Investigation and Crime Scene Operations
Examination and analysis of a fire scene are crucial in determining the cause and origin of the fire. Preservation of the fire scene should begin promptly with the first responding companies. It's critical for units to avoid unnecessary disturbance of the scene, especially during overhauling processes. This is in line with option B which states that the preservation of the fire scene should start with the first due companies and that they should minimize scene disturbance. Additionally, all deceased on arrival (DOA) should be treated as potential crime victims unless they are clearly related to a medical emergency, aligning with option C which emphasizes every DOA should be viewed as a potential crime victim. The fire scene is not automatically considered a crime scene; it becomes one if the Incident Commander declares the fire incendiary. However, until the investigation is complete, the scene should be treated as evidence. The use of gasoline powered equipment is often avoided as it can contaminate the scene or pose safety risks, so option A is also viable. Option D is partially correct, as the fire scene may become a crime scene upon determination by the proper authorities, not solely by the Incident Commander's declaration.