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Arson Detection
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Arson = crime of intentionally starting a fire that damages property
Difficult to prove – - fire or firefighters destroy evidence - combustible liquids (accelerants) evaporate quickly
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Investigate ASAP 1st – look for point of origin Then, look for causes Multiple points of origin usually means deliberate fire
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Types of Fires Natural Accidental Undetermined Deliberate Category
Description Natural Accidental Undetermined Deliberate
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Types of Fires Natural Caused by acts of nature; ex. Lightening strike
Category Description Natural Caused by acts of nature; ex. Lightening strike Accidental Undetermined Deliberate
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Types of Fires Natural Caused by acts of nature; ex. Lightening strike
Category Description Natural Caused by acts of nature; ex. Lightening strike Accidental Unintentional & explainable; ex. Faulty wiring, carelessness Undetermined Deliberate
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Types of Fires Natural Caused by acts of nature; ex. Lightening strike
Category Description Natural Caused by acts of nature; ex. Lightening strike Accidental Unintentional & explainable; ex. Faulty wiring, carelessness Undetermined Cause unknown & can’t be identified Deliberate
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Types of Fires Natural Caused by acts of nature; ex. Lightening strike
Category Description Natural Caused by acts of nature; ex. Lightening strike Accidental Unintentional & explainable; ex. Faulty wiring, carelessness Undetermined Cause unknown & can’t be identified Deliberate Intentionally set – may or may not be arson; ex. Campfire spreads out of control
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Burn Patterns Pattern Description Indication V-shape
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers Shows a trail from one area to another Accelerant used to spread fire
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Burn Patterns V-shape Narrow at bottom, spreads out as rises
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers Shows a trail from one area to another Accelerant used to spread fire Arc damage
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Burn Patterns Arc damage Spark caused by release of electricity
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers Shows a trail from one area to another Accelerant used to spread fire Arc damage Spark caused by release of electricity Electrical wire; or from wire insulation
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Burn Patterns Arc damage Spark caused by release of electricity
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers Shows a trail from one area to another Accelerant used to spread fire Arc damage Spark caused by release of electricity Electrical wire; or from wire insulation Pool or plant
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Burn Patterns Pool or plant Look like puddles
Description Indication V-shape Narrow at bottom, spreads out as rises Normal pattern, no accelerant Inverted cone Wider at bottom, narrower up May be accident or accelerant poured along floor Alligatoring Looks like scales of alligator May be from accelerant, maybe not Spalling Layers of concrete break away b/c of high temps Streamers Shows a trail from one area to another Accelerant used to spread fire Arc damage Spark caused by release of electricity Electrical wire; or from wire insulation Pool or plant Look like puddles Accelerants collected in a pool at lowest point
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