Chapter 11.2 Notes.

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Presentation transcript:

Chapter 11.2 Notes

Searching the Fire Scene Must determine the accelerant before evaporation Does not require a search warrant May allow for seizure of evidence Must focus on finding the origin

The search Containers Streamers Ignition device Breaking and entering Theft Begin interviews with eyewitnesses

Ancillary factors Drafts and winds Collapsing floors, roofs, walls Stairways, airshafts, holes Flammable liquids flow to lowest point

Accelerants The most common are kerosene and gasoline Portable vapor detectors can be used as a screening device, and, also trained dogs First fire research laboratory in the US is in Maryland

Collection and Preservation of Arson Evidence 2-3 quarts of ash, soot debris collected at point of origin Collection includes porous materials and other substances which may contain flammable residues packed in airtight containers Collection must include control substrates

Collection & Preservation cont.. Collect and seal open containers Including empty ones Search, collection of igniters Most common is the match Clothing of the suspect Placed in separate airtight container Frozen samples of soil or vegetation

Analysis of Flammable Residues Gas chromatography – separates hydrocarbon components Evidence in the airtight container should include headspace Removal of vapor and analysis yields chromatograph consistent with known hydrocarbons (hexane, benzene, toluene, xylenes) New method includes vapor concentration Uses a charcoal strip May sometimes need to use GC/MS