NFPA 921
NFPA 921 : Guide for Fire and Explosion Investigations: A component document of the National Fire Codes promulgated and published by the National Fire Protection Association. The National Association of Fire Investigators considers NFPA 921 as the definitive standard on fire investigation methodology, technology, and science. NFPA 921 is written by the NFPA Technical Committee on Fire Investigations. The Technical Committee consists of up to thirty principal (voting) members and their alternates, appointed by the NFPA Board of Directors from those "vitally interested, qualified, and active" in the area of fire and explosion investigation