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Investigating a crime scene


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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