How did Jason Marshall determine that Duane Jr. was not responsible for the fire?

Jason Marshall determined that Duane Jr. was not responsible for the fire by checking security footage from a store. This method is powerful because security footage can provide direct evidence of what occurred at the time of the incident. If Duane Jr. was shown not being near the scene of the fire or engaging in any suspicious behavior, the footage could serve as a factual basis to conclude his innocence.

In contrast, while interviewing witnesses could provide insights into what others thought they saw, accounts may vary and could be unreliable. Analyzing the fire's origin typically helps professionals understand how the fire started but does not directly indicate who might be responsible. Consulting a fire investigator would provide expert analysis on the fire's characteristics, but without corroborating direct evidence like video footage, it might not definitively eliminate Duane Jr. as a suspect. Thus, the use of security footage stands out as a clear and direct method for substantiating Duane Jr.'s innocence in this scenario.