Crime Scene
Investigation Roles
1.0 Describe responsibilities of various
personnel involved in crime scene
investigations. Examples: police, detectives,
laboratory specialists, medical examiners. I,D,M
1.1 Explaining how to search, sketch, and record
data from a crime scene.
Who’s at the Scene?
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Police officers
CSI unit
District attorney
Medical examiner
Specialists
Detectives
Police Officers
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Usually 1st on the scene
Make the arrest, if possible
Call ambulance if needed
Secure the scene --- WHY?
CSI Unit
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Documents the crime scene in detail
Collects physical evidence
Medical Examiner
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May or may not be present to determine
a preliminary cause of death
Specialists
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May be called in if evidence requires
expert analysis
Entomologists
Forensic scientists
Forensic psychologists
Detectives
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Interview witnesses and consult with the
CSI unit
Investigate the crime by following leads
provided by witnesses and physical
evidence
CSI Unit’s Procedure
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Make sure scene is secure.
Initial walk-through:
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Get an overall feel for the crime scene
Find out if anything has been moved
Generate initial theories based on visual
examination
TOUCH NOTHING!
CSI Unit’s Procedure (cont.)
3.
Document the scene
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Photographs
Draw sketches of the scene
Video walk-through
STILL TOUCH NOTHING!
Collect all potential evidence
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Tag it, log it, and package it so it remains
intact during transport to the lab
May or may not do actual analysis in the lab
Crime Scene vs. Crime Lab
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Scene = Crime Scene Investigation
Lab = Forensic Science
Lab passes lab results to the lead
detective.
NOT ALL CSI’s ARE FORENSICS
SCIENTISTS!