Which of the following tools is NOT typically used in an auto alarm investigation?

In an auto alarm investigation, the primary focus is on determining the cause of the alarm and ensuring safety in a potentially alarmed environment. The fire hose is not a tool used specifically for investigating alarms; rather, it is primarily utilized for extinguishing fires or applying water in active fire suppression scenarios. The use of a fire hose is more related to firefighting efforts rather than the investigative processes surrounding an alarm.

On the other hand, the Knox Key is essential for accessing secured areas when responding to an alarm, forcible entry tools may be needed to gain access to a building or vehicle if it's required for investigation, and thermal imaging (TI) devices are valuable for detecting heat sources or potential fire hazards during such investigations. These tools are integral to the response and investigation process, showing how they are more relevant than the fire hose in this specific context.