Which of the following is NOT an indicator of incendiary fires?

The option indicating a history of smoke alarms is not typically considered an indicator of incendiary fires. Smoke alarms are installed primarily for safety and protection against fires, and their existence suggests that there was a concern for fire safety within the environment. Instead of pointing towards an intentional act of arson, a history of smoke alarms indicates that occupants were taking preventive measures to alert individuals of a fire and mitigate risks, which is contrary to the common behaviors associated with incendiary activities.

In contrast, factors like financial stress, an owner having multiple fires, and evidence of other crimes tend to suggest motives or circumstances that may align with intentional fire setting, making them more likely indicators of incendiary fires. Each of these factors reflects potential motivations or patterns often seen in arson cases, thus reinforcing their significance as indicators in the context of fire investigations.