Forensic Explosives Investigation Procedures
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Questions and Answers

Where is the probable origin of a fire most likely to be found?

  • Near the windows
  • On the ceiling
  • At the lowest point showing intense burning (correct)
  • In the middle of the room
  • What is indicative of the presence of a flammable liquid at a fire scene?

  • Excess accelerant in non-porous materials
  • An ignition device such as a match (correct)
  • Ash and soot collected in plastic containers
  • Severe burning found on the ceiling
  • How should ash and soot from the suspect point of origin of a fire be collected?

  • Mixing with uncontaminated control specimens
  • Storing in wide-mouth glass jars (correct)
  • Leaving in open air
  • Using plastic containers
  • What method is recommended for locating traces of flammable liquid residues at a fire scene?

    <p>Sniffer dogs or vapor detector</p> Signup and view all the answers

    What must accompany the collection of materials suspected of containing volatile liquids at a fire scene?

    <p>A substrate control from an unrelated site</p> Signup and view all the answers

    What should never be used to store fire scene evidence?

    <p>Plastic containers</p> Signup and view all the answers

    What distinguishes high explosives from low explosives?

    <p>Speed of decomposition</p> Signup and view all the answers

    Which explosive undergoes deflagration causing walls of the container to fragment and fly outward in all directions?

    <p>Smokeless powder</p> Signup and view all the answers

    What is the primary composition of black powder?

    <p>Potassium or sodium nitrate</p> Signup and view all the answers

    Which collection serves as an invaluable reference for identifying accelerants like gasoline?

    <p>Ignitable Liquids Reference Hydrocarbon Collection (ILRC)</p> Signup and view all the answers

    What constitutes the nature of an explosion?

    <p>Sudden buildup of gas pressure</p> Signup and view all the answers

    How are complex chromatographic patterns simplified for analysis during bomb site investigations?

    <p>Gas chromatography/mass spectrometry</p> Signup and view all the answers

    What is the purpose of systematically searching the entire bomb site?

    <p>To find any detonating mechanism or foreign items</p> Signup and view all the answers

    Why is it important to preserve loose soil and debris from a crater at the explosion site?

    <p>To examine them microscopically for explosive traces</p> Signup and view all the answers

    What screening method is mentioned for detecting explosive residues on collected objects?

    <p>Ion mobility spectrometer</p> Signup and view all the answers

    Why are materials collected for examination required to be placed in sealed air-tight containers?

    <p>To prevent diffusion of explosive residues</p> Signup and view all the answers

    What is one of the methods mentioned for analyzing debris collected from explosion scenes?

    <p>Color spot tests</p> Signup and view all the answers

    Why are articles collected from different areas packaged in separate air-tight containers?

    <p>To avoid contamination between different materials</p> Signup and view all the answers

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