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Chapter 3

Chapter 3. Menu. Evidence and the Crime Scene. Photographing the Crime Scene. Sketching the Crime Scene. Search Patterns. Scenario : Gang War Crime Scene. Scenario : Armed Robbery at Convenience Store. Preserving the Crime Scene. Preserving the Crime Scene.

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Chapter 3

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  1. Chapter 3

  2. Menu Evidence and the Crime Scene Photographing the Crime Scene Sketching the Crime Scene Search Patterns Scenario:Gang War Crime Scene Scenario: Armed Robbery at Convenience Store

  3. Preserving the Crime Scene

  4. Preserving the Crime Scene

  5. Preserving the Crime Scene

  6. Preserving the Crime Scene

  7. Preserving the Crime Scene Q: 2, 5

  8. Evidence People Q: 17

  9. Evidence People & Things

  10. What is Evidence? • Any item which establishes the facts of a related criminal case

  11. What is Evidence? • Items found at the scene of the crime or on the victim

  12. What is Evidence? • Items found on the suspect or in the suspect’s environment Q: 3, 14

  13. What is a Criminalist? A person trained to: • Collect Evidence • Make Scientific Tests

  14. What is a Criminalist? A person trained to: • Assess various types of physical evidence

  15. What is a Criminalist? A person trained to: • Assess various types of physical evidence

  16. What is a Criminalist? A person trained to: • Assess various types of physical evidence

  17. Crime Scene Techniques Officers at scene must create an accurate and objective visual record before any items are moved or contaminated .

  18. Crime Scene Techniques Officers at scene must create an accurate and objective visual record before any items are moved or contaminated .

  19. Crime Scene Techniques Officers at scene must create an accurate and objective visual record before any items are moved or contaminated . Q: 1, 4, 15, 16

  20. Menu Evidence and the Crime Scene Photographing the Crime Scene Sketching the Crime Scene Search Patterns Scenario:Gang War Crime Scene Scenario: Armed Robbery at Convenience Store

  21. Photographing theCrime Scene A visual record of the original conditions at the crime scene Q: 21

  22. Photographing theCrime Scene Forms an organized sequence of all locations and objects

  23. Photographing the Crime Scene Photos should be taken at • Long Range • Mid Range • Short Range Q: 12

  24. Long Range Photos Broad and General

  25. Mid Range Photos Portion of the scene. Attention to some objects

  26. Close-Up Photos Specific area on an object or victim

  27. Videotaping the Scene Not to be used to replace still photos

  28. Videotaping the Scene Produce a continuous recording of all events that occur at the scene Q: 18

  29. Videotaping the Scene Include long-range, mid range and close ups

  30. Menu Evidence and the Crime Scene Photographing the Crime Scene Sketching the Crime Scene Search Patterns Scenario:Gang War Crime Scene Scenario: Armed Robbery at Convenience Store

  31. Sketching the Crime Scene An important tool in investigations

  32. Sketching the Crime Scene An important tool in investigations

  33. Useful in questioning witnesses and suspects

  34. Useful when writing reports

  35. Excellent companions to photographs

  36. Offers accurate information about placement of objects

  37. Determines relationships between distances and things

  38. Complements notes and photos taken at crime scene Q: 13

  39. How Are Sketches Prepared? Simple line drawings Accurate and consistent scale Q: 11, 24

  40. How Are Sketches Prepared? All measurements must be accurate

  41. How Are Sketches Prepared? Use graph paper to improve accuracy of scale

  42. How Are Sketches Prepared? Use standard symbols to designate objects

  43. SketchingMethods

  44. SketchingMethods Rectangular Triangulation

  45. SketchingMethods Rectangular Triangulation Cross-Projection Base-Line Compass

  46. Sketching Methods Rectangular Measures the distance of an object -from two fixed lines at right angles to each other a

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