Fire Debris Analysis
Definition
The laboratory examination of material collected from a suspected arson scene to detect and identify accelerants (hydrocarbons from petrol, lighter fluid, or other ignitable liquids) that distinguish an intentional fire from an accidental one.
- Target
- Ignitable liquid residues, e.g. petrol, lighter fluid
- Sample source
- Material collected from a suspected arson scene
- Purpose
- Distinguish intentional from accidental fire
- Setting
- Laboratory examination
Common questions
What technique is most commonly used to analyse fire debris for accelerants?+
Gas chromatography, often coupled with mass spectrometry, is the standard method, since it separates and identifies the hydrocarbon components of an ignitable liquid even after the fire has partially consumed or altered the original material.
Why can fire debris analysis be inconclusive even when arson is suspected?+
Many household materials produce hydrocarbon byproducts during combustion that can mimic or mask accelerant signatures, and total burn can destroy residues entirely, so a negative result does not rule out an intentionally set fire.
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