Do now: Why do you think pictures are so important for a crime scene investigation?

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Do now Why do you think pictures are so
important for a crime scene investigation?
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• THE CASE
• A man works with the police to identify
  criminals. His help is invaluable even when he
  hasnt witnessed a crime. Many of the criminals
  he identifies are never caught, but the police
  continue to ask the man for help.
  Coincidentally, the mans first name describes
  what he does to help the police.
• THE MYSTERY
• What is the mans first name and what is his
  occupation?
• CLUES
• The mans name is not unusual.
• The man is on the police payroll.
• The man works with his hands and listens
  carefully to what other people have to say.
• The man is a trained professional, but also
  draws on natural talent.
• The man might share his name with the whole
  department.
• The man has a 3 letter name.

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First On The Scene

• Aim How does Locards Principle Apply to the
  Crime Scene?

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Ripples in a pond are like traces left at the
scene of a crime, they are produced as a
consequence of an action. They can be
far-reaching and often misleading. The scientist
must interpret them correctly for their true
significance.
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The exchange of materials between two objects
that come into contact with one another.
Locards Exchange Principle
Every Contact Leaves a Trace
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Every Contact Leaves a Trace.

• Sir Edmond Locard (1877-1966)
• Sherlock Holmes of France
• Created a very simple idea, that while obvious to
  us now, was (and still is) quite powerful to the
  science of Forensics.
• Being able to find the trace is only limited by
  our abilities, knowledge, and degree of
  refinement of techniques equipment.

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Forensic Science can be defined as any science
as it relates to law. Because of this, any
science can be a Forensic science.

• Crime Scene Processing Protocol
• Great care must be taken in order not to
  contaminate the crime scene.
• Locards Exchange principle state that
• When a person has contact with someone or
  something, that person always leaves something
  behind. It may be a hair or a skin cell, but
  something is there.

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Basics of crime scene processing

• 1. INTERVIEW 2. EXAMINE 3. PHOTOGRAPH 4.
  SKETCH 5. PROCESS

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• Interview The crime scene technician must
  interview the first officer at the scene or the
  victim to ascertain the "theory" of the case.
• Examine Examine the scene to identify possible
  items of evidentiary nature, identify point of
  entry and point of exit, and getting the general
  layout of the crime scene.
• Photograph Photographing the crime scene to
  record a pictorial view of what the scene looks
  like and to record items of possible evidence.
  Crime scene photographs are generally taken in
  two categories, overall views and items of
  evidence.

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• Sketch A rough sketch is completed by the crime
  scene technician to demonstrate the layout of the
  crime scene or to identify the exact position of
  the deceased victim or evidence within the crime
  scene.
• Process The crime scene technician will process
  the crime scene for evidence, both physical and
  testimonial evidence. It is the crime scene
  technicians responsibility to identify, evaluate
  and collect physical evidence from the crime
  scene for further analysis by a crime laboratory.

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Chain of evidenceAn unbroken chain of events
regarding all evidence collected. This includes
the location of all evidence from the time
collected until submitted in court as well as the
person responsible for the evidence.

• 1. Do not move anything
• 2. Take measurements in order to complete a
  detailed, scaled sketch. Include the scale on
  the drawing
• 3. Record the evidence you would like to see in
  the future. You may label any evidence with a
  note card or record the number if a note card is
  already in place.
• 4. Request additional photographs.
• 5. Be aware of EVERYTHING. Use your best skills
  of observation.

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Personnel Duties Responsibilities

• Team Leader
• Assumes control at scene, conducts initial
  walk-through, determines search patterns,
  designates individuals for jobs
• Photographer
• Sketch Artist
• Evidence Recorder Custodian
• Maintain logs proper packaging
• Specialists
• Forensic Anthropologist - Blood Spatter Analyst
• Bomb Technician - Medical Examiner - Entomologist
  - Odontologist - Engineer - Latent Print
  Examiner - Ballistics - Arson -
  Impression Expert

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Case Study How can Physical Evidence point
investigators in the right direction? Eyewitness
accounts may not always be truthful!
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