crime scene investigation n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Crime Scene Investigation PowerPoint Presentation
Download Presentation
Crime Scene Investigation

Loading in 2 Seconds...

play fullscreen
1 / 48

Crime Scene Investigation - PowerPoint PPT Presentation


  • 318 Views
  • Uploaded on

Crime Scene Investigation. Crime Scene Investigation. Defining the Crime Scene. Information Obtained from a Crime Scene. Processing the Crime Scene. Crime Scene Investigation. Defining the Crime Scene. Information Obtained from a Crime Scene. Processing the Crime Scene.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Crime Scene Investigation' - Samuel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
crime scene investigation1
Crime Scene Investigation
  • Defining the Crime Scene
  • Information Obtained from a Crime Scene
  • Processing the Crime Scene
crime scene investigation2
Crime Scene Investigation
  • Defining the Crime Scene
  • Information Obtained from a Crime Scene
  • Processing the Crime Scene
defining the crime scene
Defining the Crime Scene

Where is the crime scene?

Can be classified by:

  • Location of Criminal Activity
  • Size of Area
  • Type of Crime Committed
  • Physical Location of the Crime
defining the crime scene1
Defining the Crime Scene

Location of Criminal Activity

  • Primary = where the original crime occurred
  • Secondary = subsequent crime scenes

Let’s look at an example

primary vs secondary
Primary vs. Secondary

Tom Bosley

Scott Baio

primary vs secondary1
Primary vs. Secondary

Tom Bosley

Primary Crime Scene

Scott Baio

primary vs secondary2
Primary vs. Secondary

Tom Bosley

Secondary Crime Scene

Scott Baio

defining the crime scene2
Defining the Crime Scene

Size of Crime Scene

  • Macroscopic = one location, composed of many microscopic crime scenes
  • Microscopic = focuses on specific type of physical evidence
macroscopic vs microscopic
Macroscopic vs. Microscopic

Tom Bosley

Macroscopic = McDonalds Area

(Tom Bosley’s body, Chachi, the dumpster, etc.)

Scott Baio

macroscopic vs microscopic1
Macroscopic vs. Microscopic

GSR on Baio’s hand

Tom Bosley

Microscopic

Scott Baio

macroscopic vs microscopic2
Macroscopic vs. Microscopic

Tom Bosley’s Leg Wound

Tom Bosley

Microscopic

Scott Baio

defining the crime scene3
Defining the Crime Scene
  • Type of Crime Committed
    • Homicide, Robbery, Sexual Assault, etc.
  • Physical Location of Crime Scene
    • Indoors, Outdoors, Vehicle, etc.
crime scene investigation3
Crime Scene Investigation
  • Defining the Crime Scene
  • Information Obtained from a Crime Scene
  • Processing the Crime Scene
info from scene
Info from Scene
  • Corpus Delicti - the body of the offense
    • Must be proven a crime has been committed (i.e. dead body should be produced in murder trial)
  • Modus Operandi (MO) – a certain criminal’s repeated behavior.
info from scene1
Info from Scene

Linkage of persons, places and things

  • Locard Exchange Principle: when two objects come into contact with one another, an exchange of matter takes place.
  • Physical evidence can link suspect, victim, crime scene, and objects to one another
info from scene2
Info from Scene

Suspect

Victim

Object

Crime Scene

info from scene3
Info from Scene

All found at scene

info from scene4
Info from Scene

Bullet in Bosley

info from scene5
Info from Scene

Fingerprints on gun

info from scene6
Info from Scene

Baio’s Hair on Bosley

info from scene7
Info from Scene

Baio’s suspenders’ button

In dumpster

info from scene8
Info from Scene
  • Proving or disproving witness statements
    • Can identify intentional lies
    • Can identify unintentional eyewitness mistakes
  • Identification of Suspects
    • Fingerprints and DNA
  • Identification of Unknown Substances
    • Illegal drugs, poison, anthrax
info from scene9
Info from Scene
  • Corpus Delicti
  • Modus Operendi
  • Linking people, objects, crime scene
  • Proving witness/suspect statements
  • Identification of suspects
  • Identification of unknown substances
  • Providing investigative leads
info from scene10
Info from Scene
  • Corpus Delicti
  • Modus Operendi
  • Linking people, objects, crime scene
  • Proving witness/suspect statements
  • Identification of suspects
  • Identification of unknown substances
  • Proving investigative leads

Reconstruction

of

Crime

crime scene investigation4
Crime Scene Investigation
  • Defining the Crime Scene
  • Information Obtained from a Crime Scene
  • Processing the Crime Scene
processing the crime scene
Processing the Crime Scene

Crime Scene Investigation Models

  • Requires teamwork by crime scene personnel and investigators
  • See figure 8.1 in text
  • the individual processing the scene depends on the state/community
  • Detectives
  • Patrol Officer
  • Crime squad
  • Lab Scientist
  • Medical Examiner
  • Crime scene tech.
processing the crime scene1
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
processing the crime scene2
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
first officer on the scene
First Officer on the Scene

Safety is the primary concern

  • Assist the victim
  • Search for and arrest suspect
  • Detain and separate witnesses
  • Protect the crime scene (barrier tape)
  • Note any changes made to the scene
processing the crime scene3
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
securing the crime scene
Securing the Crime Scene

Anyone entering the crime scene will deposit and remove evidence. (Locard Exchange Principle)

  • Secure the scene with physical barriers
  • One officer assigned to prevent entrance of unwanted personnel
  • Log kept of disturbances to scene
processing the crime scene4
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
crime scene survey
Crime Scene Survey

After the scene is secure, the investigator and first responder do a “walk-through”

  • Prepare an initial reconstruction
  • Note any temporary evidence
  • Note points of entry/exit that require attention
  • Access scene for personnel, precautions, and equipment needed
processing the crime scene5
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
crime scene documentation
Crime Scene Documentation
  • Taking notes
  • Videotaping
  • Photographing
  • Sketching
crime scene documentation1
Crime Scene Documentation

Taking Notes of the Crime Scene

  • Record activities including:
    • Notification of personnel
    • Arrival Information
    • Scene Description (environment, evidence)
    • Victim Description
crime scene documentation2
Crime Scene Documentation

Videotaping the Crime Scene

  • Introduce with case #, date, location
  • Begin with surroundings (include entrance/exits)
  • Tape Evidence (wide angle, close-up)
  • Victims viewpoint

DO NOT:

  • Narrate the video or discuss contents
  • Edit original video
crime scene documentation3
Crime Scene Documentation

Photographing the Crime Scene

  • Take examination quality photographs (used by experts to interpret evidence)
  • Every photo should be recorded in a log
  • Take with and without a scale
crime scene documentation4
Crime Scene Documentation

Sketching the Crime Scene

  • Goal is to record exact position of all evidence to aid in reconstruction.
  • Rough sketches can be refined into final sketches
  • Three techniques of measurement are used:

X

Y

X

Y

X

Y

30°

e

e

e

Triangulation

Baseline

Polar Coordinates

processing the crime scene6
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
searching the crime scene
Searching the Crime Scene
  • After scene documentation, a more thorough search of the scene is completed
  • See table 8.3 for types of search
  • Systematic search ensures no piece of physical evidence is missed
processing the crime scene7
Processing the Crime Scene
  • First Officer on the Scene
  • Securing the Crime Scene
  • Crime Scene Survey
  • Crime Scene Documentation
  • Searching the Crime Scene
  • Collection of Physical Evidence
collection of physical evidence
Collection of Physical Evidence
  • One individual designated as evidence collector
  • Temporary, fragile, or easily lost evidence should be collected first
  • Evidence placed in primary and secondary containers
collection of physical evidence1
Collection of Physical Evidence
  • Liquid or volatile evidence placed in airtight containers
  • Biological evidence placed in non-airtight container and allowed to dry
  • Each item packaged separately
crime scene investigation5
Crime Scene Investigation
  • Processing the Crime Scene
  • Lab Analysis of Evidence

After the crime scene is processed and the evidence is analyzed,

Crime Scene Reconstruction can begin

crime scene reconstruction
Crime Scene Reconstruction

Initial evidence leads to the formation of Hypotheses (guesses as to what happened)

Hypotheses are tested by additional analyses

Disproved hypotheses are thrown out, leaving a reconstruction theory

case study homicide scene
Case Study: Homicide Scene

Crime Scene

Victim

Suspects