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Crime Scene Investigationfor Explosive Incidents
Prof. Charles L. FeerDepartment of Criminal Justice
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Bomb Scene Investigations Start as Local L.E. Investigation F.B.I. investigates Terrorism A.T.F. & E. investigates explosives E.O.D. (Bomb Techs) Be Aware of Secondary Devices!
Madrid Iraq
Do not enter until told “safe” Assessing safety is on-going.
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Explosion
An explosion is: A sudden and rapid escape of
gases from a confined space. Accompanied by high
temperatures, violent shock, and loud noise. Pipe Bomb
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Three Types of Explosions
Mechanical Chemical Nuclear
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Mechanical Explosion
Occurs when pressure builds up in a container until the pressure exceeds the structural resistance of the container. Alley Effect
Chemical Explosion
Are the result of fuel and oxygen supporting rapid combustion. Redneck Bomb Maker
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Atomic Explosions
Are produced by Fission – splitting the nuclei of atoms; or,
Fusion which forces the nuclei of atoms together under great pressure.
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Energetic Materials
Two broad categories of Explosions: 1) Low Explosives – burn rather than
explode. (Need to be contained) 2) High Explosives – detonate by
shock. (Do not have to be confined.)
High ExplosivesThree groups: Primary – detonate forcefully, sensitive to heat, shock, friction. Secondary - require a detonating device or initiating explosion. Tertiary – require a booster or a secondary high explosive to detonate.
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Upon Detonation
1) Shock wave moves. Slow Mo Pressure
2) Air rushes back into void created by positive pressure. Positive – Negative Pressure
3) Fragmentation (container) and Shrapnel (attached to bomb). Flying – LEFlying – Iraq
Locating and Collecting Evidence Do NOT go in without a Bomb Tech! Locate Crater – indicates the origin
of the blast. Soil samples must be gathered from
all areas surrounding the crater. Locate remnants of the detonating
mechanism.
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Locating and Collecting Evidence
Remnants can include blasting caps, batteries, match heads, cell phones, walkie-talkies, timers. Think – Fingerprints! Think – DNA!
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Locating and Collecting Evidence
Indoor Scene – Each room should be treated as a separate crime scene.
Outdoor Scene – Locate the debris furthest from the crater, and double the distance for your perimeter.
If a suspect is arrested – collect all clothing and personal items. (Seal everything in paper bags.)
Explosive Incidents
Think Hazardous Materials!
Transportation of Haz-Mat materials, including explosives require special conditions.
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Questions?
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