forensics ch 15 and 16

  1. arson
    the willful and malicious burning of property
  2. burning of property or destruction
    must show fire is incendiary in origin
    est. by evidence or expert testimony
    presence of accelerants incendiary devices
    started with malice
    all possile natural and accidental causes have been eliminated
    for arson you must show
  3. motives of arson
    • revenge
    • vandalism
    • profit
    • crime concealment
    • extremist/ terrorism,
    • excitement
  4. pyromaina
    • deliberate setting of fire
    • tension or affective arousal before the act
    • pleasure , gratification, or relief when doing so or witnessing aftermath
    • rare
  5. serial arson
    • 3 or more separate fires
    • setting episodes with a cooling off period
    • male 94%
    • white 81.9 %
    • 49% lived within 1/2 to 2 miles away
    • 50% were 27 years old or younger
    • 87 prior felony
    • more then half watch the fire be put out
  6. 1. a fuel must be present
    2. oxygen must be available in sufficient quantity to combine with the fuel
    3. heat must be applied to initiate the combustion and sufficient heat must be generated to sustain the reaction
    3 requirements to initiate and sustain fire
  7. accelerant
    • any material used to start a fire
    • gasoline, kerosene
    • can dissipate quickly
  8. ignition devices
    candle, match , may burn up
  9. point of origin
    best chance at finding accelerant or ignition
  10. separate and unconnected fires
    "streamers" or "trailers" used to spread the fire
    gas smell
    intense warping of metal appliances
    forced entry
    signs of arson
  11. collection of arson stuff
    • rugs, upholstery,rags
    • use airtight containers
    • new clean paint cans
    • plastic polyethylene bags
    • substrate control, similar but uncontaminated area ( unburned carpet)
    • Igniters
  12. explosion
    a chemical or mechanical action causes by combustion accompanied by the creation of heat and the rapid expansion of gases
  13. high explosives
    velocity of detonation greater then less then 1000 meters per second
  14. low explosion
    velocity of detonation less then 1000 meters per second.
  15. low explosion
    • black powder/smokeless
    • most widely used easily available
    • lethal when confined pipe bomb
    • chlorate mixtures
    • potassium chloride plus sugar
    • gas air mixtures
    • natural gas to air.
  16. high explosive
    primary-easily detonate sensitive to heat shock and friction used to detonate other explosives primers blasting caps.
  17. secondary explosive
    • insensitive to heat, shock or friction
    • must be detonated by an initiative explosive
    • detonating cord
    • clocks, mercury, switches, cell phone
  18. collection of explosives
    • K9s
    • loose soil from crater or blast seat (origin)
    • detonation mechanisms
    • (wires, batteries, clock parts, cord, cell phone parts,
    • pipe bomb parts
    • car/truck bomb parts
    • ion mobility spectometer (IMS)
    • screens for the presence of residue
    • packaged in air tight containers
Card Set
forensics ch 15 and 16
for final