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September 5, 2012Investigating a Crime        scene
1. Initial assessment•   Identify any hazards•   Then make the area safe•   Determine if a crime has taken place•   Identi...
2. Securing the crime scene• Preserve the scene as it was found• Restrict access to avoid contamination• Protect the scene...
contamination• The presence of small amounts of substance  in another• If one piece of evidence comes into contact  with a...
3. Recording the scene•   Sketches•   Notes•   Photographs•   video09/05/12
4. Searching the scene• Systematically• Protective equipment ( also avoids  contamination)• Mark location of evidence09/05...
Collecting fingerprints• Why are these important?• 3 types:      – Plastic – in a soft or wet substance eg putty      – Vi...
Basic fingerprint patterns09/05/12
Taking fingerprints• 1. Using ink, collect a set of prints using each  of your fingers• 2. Identify the patterns you see• ...
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Investigating a crime scene

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Transcript of "Investigating a crime scene"

  1. 1. September 5, 2012Investigating a Crime scene
  2. 2. 1. Initial assessment• Identify any hazards• Then make the area safe• Determine if a crime has taken place• Identify any victims• Identify any witnesses and suspects (and keep them apart)09/05/12
  3. 3. 2. Securing the crime scene• Preserve the scene as it was found• Restrict access to avoid contamination• Protect the scene – from weather, public, media (TV)• Common approach path ( single entrance)09/05/12
  4. 4. contamination• The presence of small amounts of substance in another• If one piece of evidence comes into contact with another, small amounts can be transferred09/05/12
  5. 5. 3. Recording the scene• Sketches• Notes• Photographs• video09/05/12
  6. 6. 4. Searching the scene• Systematically• Protective equipment ( also avoids contamination)• Mark location of evidence09/05/12
  7. 7. Collecting fingerprints• Why are these important?• 3 types: – Plastic – in a soft or wet substance eg putty – Visible – from eg paint, chocolate, ink – Hidden (latent) – from oil and sweat on skin09/05/12
  8. 8. Basic fingerprint patterns09/05/12
  9. 9. Taking fingerprints• 1. Using ink, collect a set of prints using each of your fingers• 2. Identify the patterns you see• 3. Collect some of the latent prints – using carbon powder• 4. Can you match the suspect to the scene of the crime?09/05/12
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