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How evidence is handled at a crime scene

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Lee McCord

on 24 October 2013

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Transcript of How evidence is handled at a crime scene

How evidence is handled at a
crime scene

Principle of exchange
Known as Locard's Exchange Principle
Types of Evidence
Two types
Direct evidence- Includes first hand observations such as eyewitness accounts
Circumstantial evidence- Indirect evidence that can be used to imply a fact but that does not directly prove it.
What is the purpose of Crime-Scene Investigation
Recognize document, and collect evidence at the Scene of a crime
Trace Evidence- Two people come into contact with each other, a physical transfer occurs
Other evidence that could be used
Class evidence-Narrows an identity to a group of persons or things.
Individual evidence- Narrows an identity to a single person
Pet hair on your clothes or rugs
Hair on your brush
Finger print on a glass
Soil tracked into your house on your shoes
A drop of blood on t-shirt
A used facial tissue
Paint chips
Broken glass
A fiber from clothing
The Way out
The Crime-Scene Investigation Team
Legal and Scientific Professional
- Police officers: usually first to arrive
-Crime scene investigators: document the crime scene in detail and collect physical evidence.
-Medical examiners: determine the cause of death when a homicide has occurred.

Investigation team cont.
-Detectives-look for leads by interviewing witnesses and talking to the crime-scene investigator about the evidence
The Seven s of Crime-Scene Investigation
1. Securing the scene
2. Separating the witnesses
When did the crime occur
who called in the crime
who is the victim
can the perpetrator be identified
what did you see happen
where where you when you observed the crime scene
Seven S cont.
3. Scanning the scene
primary crime scene
Secondary crime scene
4. seeing the scene
5. Sketching the scene
6. Searching for evidence
7. securing and collecting evidence
Analyze The Evidence
Crime-Scene Reconstruction
Forming a hypothesis of the sequence of events from before the crime was committed through its commission.
Full transcript