Coffee Break Training: Fire/Arson and Explosion Investigation Curriculum: Processing a Fire Scene for Evidence [open pdf - 193KB]
"Fire investigators must control access to the fire scene after fire suppression to ensure that evidence is properly preserved, collected, documented and transported to avoid contamination. The investigator should also ensure that packaging, transportation and storage procedures are meticulously followed to prevent any destructive changes in the condition of evidence or lapses in the chain of custody."
Coffee Break Training - Fire Investigation Series No. FI-2013-2
United States Fire Administration: http://www.usfa.fema.gov/