Which option is NOT an evidentiary factor to consider in fire investigations?

In fire investigations, evaluating various evidentiary factors is essential to determine the cause and origin of a fire. The presence of fire extinguishers, while an important aspect of fire safety and prevention, does not directly impact the investigation's conclusions regarding the cause of the fire.

Fire extinguishers serve a preventive function, indicating that there were safety measures in place to combat a potential fire. However, they do not provide direct evidence about the circumstances surrounding the fire's origin or potential malicious intent. In contrast, factors such as a history of code violations or overinsurance can imply negligence or potential motive for arson. Additionally, the materials and methods used in the construction of the property may help in understanding how the fire spread or originated.

Thus, while fire extinguishers are relevant in a broader context of fire safety, they are not an evidentiary factor that influences the investigation in terms of cause or culpability.