9/18/2015 crime scene investigation for explosive incidents prof. charles l. feer department of...

04/19/23

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.

Turkey News

Turkey 2

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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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