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Collecting and Recovering Evidence of Explosions

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Presentation on theme: "Collecting and Recovering Evidence of Explosions"— Presentation transcript:

1 Collecting and Recovering Evidence of Explosions
Forensic Investigation of Explosives May 7, 2015 Sanders

2 Ion Mobility Spectrometer
A portable Ion mobility spectrometer is used to rapidly detect and identify trace quantities of explosives. August 24, 2019 Unit 14: Explosives

3 Ion Mobility Spectrometer
Ion-mobility spectrometry is an analytical technique used to separate and identify ionized molecules in the gas phase based on their mobility in a carrier buffer gas. August 24, 2019 Unit 14: Explosives

4 Collection and Packaging
The entire bomb site must be systematically searched to recover any trace of a detonating mechanism or any other item that is foreign to the explosion site. August 24, 2019 Unit 14: Explosives

5 Crime Scene Objects located at or near the origin of the explosion must be collected for laboratory examination. August 24, 2019 Unit 14: Explosives

6 Common Explosive The most obvious characteristic of an explosive is the presence of a crater at the origin of the blast. high explosive contained low explosive August 24, 2019 Unit 14: Explosives

7 Packaging All materials collected at bombing scenes must be placed in airtight containers. August 24, 2019 Unit 14: Explosives

8 Examination of Debris Debris collected at explosions is examined microscopically for explosive particles. August 24, 2019 Unit 14: Explosives

9 Sensitivity in Explosives
Recovered debris may be thoroughly rinsed with organic solvents and analyzed by testing procedures that include Color spot tests Thin layer chromatography Gas chromatography Mass spectrometry August 24, 2019 Unit 14: Explosives

10 Unconsumed Explosives
Unconsumed explosives are identified by either infrared spectrophotometry or X-ray diffraction. August 24, 2019 Unit 14: Explosives

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