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Crime Scene Investigation and Evidence Collection

Crime Scene Investigation and Evidence Collection. CHAPTER 2 8/22/13. Introduction. Recognizing Documenting And collecting evidence Only information to help figure out what happen. Principle of Exchange. Physical Transfer: Hair, fibers, blood, and skin cells

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Crime Scene Investigation and Evidence Collection

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  1. Crime Scene Investigation and Evidence Collection CHAPTER 2 8/22/13

  2. Introduction • Recognizing • Documenting • And collecting evidence • Only information to help figure out what happen

  3. Principle of Exchange • Physical Transfer: • Hair, fibers, blood, and skin cells • Longer/more intense results in a greater transfer • Trace Evidence: • What the forensic examiner collects

  4. Trace Evidence Examples • Pet Hair on clothing • Hair on your brush • Fingerprints on glass • Dirt or soiled tracks • Blood droplets • Paint chips • Broken glass • Fibers

  5. Types of Evidence • Direct Evidence: • First hand observations • Eyewitness accounts • Police Dashboard video cameras • Circumstantial Evidence: • Indirect evidence that can be used to imply fact but does not directly prove it. • Biological or physical • Body fluids, fingerprints

  6. Types of Evidence • Class Evidence: • Narrows the identity to a group of persons or things. • Blood type • Individual Evidence: • Narrows an identity to a single person or thing.

  7. Crime Team • Legal professionals and scientific professionals who work together to solve a crime. • Police Officers • CSI’s • Medical examiners • Detectives • Specialists

  8. Seven S’s of CSI • Securing the Scene • Separating the Witnesses • Scanning the Scene • Seeing the Scene • Sketching the Scene • Searching for Evidence • Securing and Collecting Evidence

  9. Securing the Scene • The first responding Police Officer • Ensure all individuals are safe • Preserving evidence

  10. Separating the Witnesses • Witnesses are not allowed to speak to one another • When did the crime occur? • Who called in Crime? • Who is the victim? • What did you see? • Where were you when you observed the crime scene?

  11. Scan the Scene • Primary Crime Scene • Ex. Place where crime happen • Secondary Crime Scene • Ex. Home of suspect • Photos to be taken

  12. Seeing the Scene • Photos of the overall scene • Close up photos • w/ and w/o measuring ruler • Several different angles and distances

  13. Sketching the Scene • A rough sketch initially • More precise final copy • Directional • 2 immovable landmarks • Virtual Crime Scenes

  14. Searching for Evidence • Spiral • Grid • Linear • Quadrant/Zone • Additional light and tools to assist

  15. Securing and Collecting Evidence • Properly Packaged • Sealed and labeled using proper procedures • Bindle Paper • Plastic container • Labeled • Log • Case # • Inventory • Description • Suspect Name • Victim Name • Date/Time of recovery • Signature of person who Recovered • Signature of witness present during collection

  16. Securing and Collecting Cont’d • Packaging Evidence • Each piece of evidence should be sealed in separate evidence bags • Chain of Custody • Each person who handles evidence must use proper protocol and procedures

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