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In this episode, hosts Scott Kuhlman and Chasity Owens continue their deep dive into NFPA 921 Chapter 6 with Part 2: Fire Patterns.

The episode blends real-world case studies with foundational fire science, reinforcing how fire investigators interpret patterns, validate origin hypotheses, and apply the scientific method in the field.

Listeners are first brought into two compelling case studies: a hybrid vehicle fire with origin traced to the rear hatchback area despite severe damage, and a commercial fire involving a lithium-ion battery-powered blower where pattern interpretation was later confirmed through video evidence. These examples highlight the importance of pattern recognition, corroboration, and resisting premature conclusions.

The discussion then transitions into core concepts from NFPA 921 Chapter 6, including fire effects, fire pattern generation, and pattern geometry. The hosts emphasize that fire patterns are not standalone proof of origin but must be analyzed alongside fire dynamics, heat release rate, ventilation, and witness statements.

Key learning points include:

•  Fire patterns reveal movement and intensity, not cause by themselves 
•  Misinterpretation risks (e.g., “pour patterns”) and the importance of avoiding bias 
•  The role of heat release rate and ventilation as primary drivers of pattern development 
•  Practical application of the scientific method for origin determination

The episode also explores legal-style questioning, helping investigators strengthen courtroom articulation and defend their methodology under scrutiny.

To wrap up, the hosts introduce upcoming training opportunities and reinforce the importance of continued education, collaboration, and critical thinking in the evolving field of fire investigation.

Alabama Chapter IAAI – 2026 Free Spring Training (April 7, 2026 – Decatur, AL) 

International Association of Arson Investigators ITC Conference (April 26–30, 2026 – St. Louis, MO) 

 Montana IAAI Annual Training Conference (May 12–14, 2026 – Billings, MT) 

 Wyoming IAAI Annual Conference (June 10–12, 2026 – Laramie, WY) 

 Georgia IAAI Annual Training Conference (July 27–30, 2026 – Savannah, GA)

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