unit 2: evidence
DESCRIPTION
Unit 2: Evidence. 2.3 Class/Individual Evidence. Class vs Individual. Physical evidence is broken into two main categories: Class Evidence: characteristics common to a group of similar objects or persons. - PowerPoint PPT PresentationTRANSCRIPT
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Unit 2: Evidence
2.3 Class/Individual Evidence
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Class vs Individual• Physical evidence is broken into
two main categories:
• Class Evidence: characteristics common to a group of similar objects or persons.
• Individual Evidence: can be linked to a unique, single, specific source or person.
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Purpose of class evidence
• To refine the pool of suspects.
• Size 11 shoe print found at scene.– Guarantee suspect left print?– Guarantee suspect has a size 11 shoe?
• No, but it does help focus the investigation.
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Chapter 2
Class vs Individual Evidence
Which examples do you think could be individual evidence?
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Chapter 2
Class vs Individual Evidence
The large piece of glass fits exactly to the bottle; it is individual evidence.
These fibers are class evidence; there is no way to determine if they came from this garment.
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Class or Individual?• A pistol was found in a theatre where
a man was shot. A suspect known to have owned a Derringer like this one was apprehended.
• Would this gun be considered individual or class evidence?
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Class or Individual?• Can it be determined whether theses
bullets were fired from the same gun?
• How can bullets be individualized to a gun? Explain.
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