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 (C)</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 (A)</p> Signup and view all the answers

What should never be used to store fire scene evidence?

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

What distinguishes high explosives from low explosives?

<p>Speed of decomposition (D)</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 (C)</p> Signup and view all the answers

What is the primary composition of black powder?

<p>Potassium or sodium nitrate (B)</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) (C)</p> Signup and view all the answers

What constitutes the nature of an explosion?

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

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

<p>Gas chromatography/mass spectrometry (C)</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 (D)</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 (D)</p> Signup and view all the answers

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

<p>Ion mobility spectrometer (B)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

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