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

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  • Slide 1
  • Crime Scene Investigation
  • Slide 2
  • Defining the Crime Scene Information Obtained from a Crime Scene Processing the Crime Scene
  • Slide 3
  • Crime Scene Investigation Defining the Crime Scene Information Obtained from a Crime Scene Processing the Crime Scene
  • Slide 4
  • Defining the Crime Scene Can be classified by: Location of Criminal Activity Size of Area Type of Crime Committed Physical Location of the Crime Where is the crime scene?
  • Slide 5
  • Defining the Crime Scene Location of Criminal Activity Primary = where the original crime occurred Lets look at an example Secondary = subsequent crime scenes
  • Slide 6
  • Primary vs. Secondary Tom Bosley Scott Baio
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  • Primary vs. Secondary Tom Bosley Scott Baio Primary Crime Scene
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  • Primary vs. Secondary Tom Bosley Scott Baio Secondary Crime Scene
  • Slide 9
  • 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
  • Slide 10
  • Macroscopic vs. Microscopic Tom Bosley Scott Baio Macroscopic = McDonalds Area (Tom Bosleys body, Chachi, the dumpster, etc.)
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  • Macroscopic vs. Microscopic Tom Bosley Scott Baio Microscopic GSR on Baios hand
  • Slide 12
  • Macroscopic vs. Microscopic Tom Bosley Scott Baio Microscopic Tom Bosleys Leg Wound
  • Slide 13
  • Defining the Crime Scene Type of Crime Committed Homicide, Robbery, Sexual Assault, etc. Physical Location of Crime Scene Indoors, Outdoors, Vehicle, etc.
  • Slide 14
  • Crime Scene Investigation Defining the Crime Scene Information Obtained from a Crime Scene Processing the Crime Scene
  • Slide 15
  • 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 criminals repeated behavior.
  • Slide 16
  • 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
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  • Info from Scene Victim Object Suspect Crime Scene
  • Slide 18
  • Info from Scene All found at scene
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  • Info from Scene Bullet in Bosley
  • Slide 20
  • Info from Scene Fingerprints on gun
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  • Info from Scene Baios Hair on Bosley
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  • Info from Scene Baios suspenders button In dumpster
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  • 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
  • Slide 24
  • 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
  • Slide 25
  • 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
  • Slide 26
  • Crime Scene Investigation Defining the Crime Scene Information Obtained from a Crime Scene Processing the Crime Scene
  • Slide 27
  • 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.
  • Slide 28
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 29
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 30
  • 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
  • Slide 31
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 32
  • 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
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  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 34
  • 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
  • Slide 35
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 36
  • Crime Scene Documentation Taking notes Videotaping Photographing Sketching
  • Slide 37
  • Crime Scene Documentation Taking Notes of the Crime Scene Record activities including: Notification of personnel Arrival Information Scene Description (environment, evidence) Victim Description
  • Slide 38
  • 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 Narrate the video or discuss contents Edit original video DO NOT:
  • Slide 39
  • 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
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  • 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: XYXYXY TriangulationBaselinePolar Coordinates eee 30
  • Slide 41
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 42
  • 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
  • Slide 43
  • Processing the Crime Scene 1. First Officer on the Scene 2. Securing the Crime Scene 3. Crime Scene Survey 4. Crime Scene Documentation 5. Searching the Crime Scene 6. Collection of Physical Evidence
  • Slide 44
  • 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
  • Slide 45
  • 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
  • Slide 46
  • 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
  • Slide 47
  • 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
  • Slide 48
  • Case Study: Homicide Scene Victim Suspects Crime Scene

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