Arson Chapter 7.

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Presentation transcript:

Arson Chapter 7

Determining Where & How Point of Origin Most damage V Pattern Eyewitnesses

Accident vs Incendiary Search for Accelerants and/or Ignitors Accelerants Almost always overused Collect in areas that won’t burn Discovered using an arson dog or a Vapor Trace Analyzer (VTA)

Tools in the Field Arson Dog VTA

Ignitors Most common is a match. The striking surface on matchboxes is typically composed of powdered glass and red phosphorus The match head is primarily composed of potassium chlorate

In The Lab… Once collected, accelerants are usually analyzed by a Gas Chromatographer – Mass Spectometer (GC-MS) Gas Chromatographer breaks the accelerant down into its simplest chemicals Mass Spectrometer identifies those chemicals to ID the accelerant

GC-MS

Searching for Victims Asphyxia Normal CO levels in non-smoker are <5% Approx. 5% in smokers House fires can reach 45-90% CO levels At 20% CO levels, dizziness & confusion At 35% CO levels, weakness & loss of coordination At 50%+ CO levels, loss of consciousness or death

Searching for Victims Most bodies aren’t cremated in a house fire. House fires only reach about 500-2,000oF and are put out in less than an hour from starting Cremating a body requires 1,500oF for 2 hours

Searching for Victims The medical examiner will look for two things to identify death by asphyxiation 1. Soot in mouth, throat, and lungs 2. Carboxyhemoglobin The CO will bind to hemoglobin in blood. Blood, organs, and muscles will turn bright red as a result.

Carboxyhemoglobin