CJ 3405 Lecture 2: Lecture 2

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Forensic Investigation Lecture 2 Monday, February 6, 2017
Physical Evidence:
Gun
Blood spatter/puddles
Hair
Can use physical evidence to:
Prove a fact, not necessarily guilt.
If you have enough physical evidence you can convict on circumstantial evidence alone.
Identify a suspect.
Run fingerprints through a database to identify. Dropping a wallet at a crime scene.
Provide investigative leads.
Arson criminals often come back to the scene of the crime to see how much damage they
have done
Reconstruct the crime scene.
Hitting the coffee table to recreate the scene. Coffee table too top heavy to land on its
side, would go completely over. Put Jeffrey MacDonald’s story into doubt.
Prove innocence
Use physical evidence to eliminate people.
Prove, support, or bring into question eye witness testimony
Most unreliable type of information presented in any court room.
Help you determine whether a crime was committed
Dog blood story
Identify the victim
Fingerprints, dental records,
Help establish an MO (Method of Operation)
Can be charged based on MO alone
Help with sentencing
Determine the severity of the crime
Things to think about at a crime scene:
What is present at this crime scene that doesn’t belong
o Cigarette, glass, briefcase, etc.
o If it doesn’t belong, there’s a chance that the perp brought it in
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