Arson Detection.

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Presentation transcript:

Arson Detection

Arson = crime of intentionally starting a fire that damages property Difficult to prove – - fire or firefighters destroy evidence - combustible liquids (accelerants) evaporate quickly

Investigate ASAP 1st – look for point of origin Then, look for causes Multiple points of origin usually means deliberate fire

Types of Fires Natural Accidental Undetermined Deliberate Category Description Natural Accidental Undetermined Deliberate

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

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

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

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

Burn Patterns Pattern Description Indication V-shape

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

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

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

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

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

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

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

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

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

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

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

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

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