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Title:

The Crime Scene

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The Crime Scene Vocabulary Make a vocabulary page in your notebook for each of the following terms: ... Create a rough sketch of the crime scene picture that follows ... – PowerPoint PPT presentation

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Title: The Crime Scene


1
The Crime Scene
2
Vocabulary
  • Make a vocabulary page in your notebook for each
    of the following terms
  • Primary Crime Scene
  • Secondary Crime Scene
  • Physical Evidence
  • CAD
  • Chain of Custody

3
Objectives
  • Identify the different roles and personnel
    involved in investigating a crime scene
  • Understand and explain the steps in processing a
    crime scene
  • Understand the process of collecting, storing,
    and transporting evidence

4
Crime Scene Personnel
POLICE OFFICERS are typically the first to arrive
at a crime scene. They are responsible for
securing the scene so no evidence is destroyed
and detaining persons of interest in the
crime. The CSI UNIT documents the crime scene in
detail and collects any physical evidence. The
DISTRICT ATTORNEY is often present to help
determine if any search warrants are required to
proceed and obtains those warrants from a judge.
The MEDICAL EXAMINER (if a homicide) may or may
not be present to determine a preliminary cause
of death. SPECIALISTS (forensic entomologists,
anthropologists, or psychologists) may be called
in if the evidence requires expert analysis.
DETECTIVES interview witnesses and consult with
the CSI unit. They investigate the crime by
following leads provided by witnesses and
physical evidence.
5
INTERACTIVE
  • Which of the crime scene personnel interests you
    the most? Why?
  • Which would be your least favorite? Why?

6
Crime Scene Processing
7
Interview
  • Crime Scenes are secured by the first responding
    police
  • Forensic scientist must interview the securing
    officer(s) upon arrival
  • What happened? What crime took place?
  • How was it committed?
  • Remember not all of this information may turn out
    to be true.

8
Examine the Scene
  • Examine the scene for first impressionsdoes it
    correlate to the story you got from the first
    responders?
  • Examine the scene for additional areas that need
    to be secured, possible evidence, points of
    entry/exit

9
Photograph the Scene
  • Overall, wide shots
  • Close-ups of evidence (with ruler)
  • Lots Of
  • pictures

10
Sketch the Scene
  • Once photographs have been taken the CSI needs to
    sketch the scene
  • First sketchrough sketch
  • Later, a more polished or final sketch will be
    drawn
  • Usually a birds-eye view

11
Interactive!
  • Create a rough sketch of the crime scene picture
    that follows

12
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13
Rough Sketch
  • The first drawing created upon arriving on scene
  • Doesnt have to be pretty
  • Does need
  • Accurate dimensions
  • Show location of all objects
  • Shows all evidence and evidence markers
  • Key or legend
  • Compass

14
Finished Sketch
  • Constructed with care and concern for appearance
  • Used in the courtroom
  • CAD

15
Notes
  • Note taking must be a constant activity
    throughout the processing of a crime scene
  • Detailed written description of the scene
  • Location and description of the evidence
  • Where the evidence was discovered, by whom, who
    collected it, where it was sent
  • Notes of smells, feelings, things a camera cannot
    capture
  • Audio recordings of notes can be used

16
Interactive!
  • Take notes for the following crime scene

17
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18
Process the Scene
  • Processing the scene is systematic documentation
    and search of a crime scene
  • Begin a systematic search for evidence that may
    have been missed or is not obvious
  • Search methods
  • Spiral
  • Grid
  • Line
  • Quadrant

19
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20
Collecting Physical Evidence
  • After crime scene is thoroughly documented
    evidence collection begins
  • Items should be handled carefully (gloves and
    tweezers) and bagged separately to avoid
    contamination
  • Critical areas can be vacuumed and the sweepings
    saved for trace analysis
  • Everything needs to be well labeled

21
Tools for Evidence Collection
  • Forceps and Tweezers picking up small objects
  • Plastic bottles with lids hairs, glass, fibers,
    trace evidence
  • Manila envelopes/ Paper Bags trace evidence
  • Bloodstained material should NOT be sealed in
    plastic container (mold)
  • Burned debris MUST be stored in airtight
    container

22
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23
Chain of Custody
  • Chain of Custody List of all people who had
    possession of an item of evidence
  • Usually recorded on bag/envelope/tube

24
What Evidence Would you Collect?
25
INTERACTIVE
  • Using your notes as a guide, develop a checklist
    that you could bring to a crime scene to make
    sure you dont forget anything
  • Checklist should begin with your arrival on the
    scene
  • You will be using your checklist to investigate 2
    crime scenes in the next couple of weeks.
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