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Chapter 3: THE CRIME SCENE

Chapter 3: THE CRIME SCENE. “ Oh, how simple it would all have been had I been here before they came like a herd of buffalo and wallowed all over it.” — A. Conan Doyle, in The Boscombe Valley Mystery , 1892. CRIME SCENE. Students will learn:

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Chapter 3: THE CRIME SCENE

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  1. Chapter 3:THE CRIME SCENE “Oh, how simple it would all have been had I been here before they came like a herd of buffalo and wallowed all over it.” —A. Conan Doyle, in TheBoscombe Valley Mystery, 1892

  2. CRIME SCENE Students will learn: • The steps to take when processing a crime scene. • That different types of evidence are packaged differently • The importance of the chain of custody Students will be able to: • Secure, record, and search for evidence at a mock crime scene. • Collect and package evidence at a mock crime scene using proper forensic procedures. Kendall/Hunt Publishing Company

  3. CORPUS DELICTI“Body of the Crime” • Scientists try to prove • that a _____________ _____________ • that the _________ ___________with the crime was responsible for the crime • Top Reasons for Committing a Crime • Money • Revenge • Emotion—love, hate, anger • Sources of Physical Evidence • ________________ _______________ • ______________ and/or ______________ Crime Scene • _______________) Kendall/Hunt Publishing Company

  4. CRIME SCENE TEAM • A group of professional investigators, each trained in a variety of special disciplines. • Team Members • First Police Officer on the scene • Medics (if necessary) • Investigator(s) • Medical Examiner (if necessary) • Photographer and/or Field Evidence Technician • _____________ _______________ Kendall/Hunt Publishing Company

  5. FIRST OFFICERON THE SCENE(this is not the forensic scientist) • First officer duties include: • A Assess the crime scene and assist those hurt • D Detain the witness • A Arrest the perpetrator • P Protect the crime scene • T Take notes Kendall/Hunt Publishing Company

  6. CRIME SCENE INVESTIGATION • Based on the scientific method and the Locard Exchange Principle, logic, and forensic techniques • Involves: • _________________—scene survey, documentation, collection • ______________________—comparison testing • ______________—evaluation and interpretation • ___________________—reporting and presenting Kendall/Hunt Publishing Company

  7. PROCESSING ACRIME SCENE • __________________ the scene • ___________ the scene • _______ for evidence • ____________ evidence, protecting and preserving it while maintaining the chain of custody • _______________evidence to the crime lab Kendall/Hunt Publishing Company

  8. CRIME SCENE SURVEY _____________________—performed by the crime scene investigator, the first officer and sometimes the lead detective • ___________ of a reconstruction theory (but keep an open mind, be curious and skeptical) • ______________________________ that could change over time. • ________________________conditions • ___________________________, as well as paths of travel within the crime scene • _______________________ of who, what, where, when, and how • ___________________ within the crime scene for personnel, precautions or equipment and notify superior officers or other agencies Kendall/Hunt Publishing Company

  9. DOCUMENTATION • _____________conditions, description of the crime, location of the evidence relative to other key points, the names of all people involved, modifications that have occurred and other relevant information • _______________—photos of scene and surroundings, mid-range to close-up photos with various angles of each piece of evidence, photos as viewed by any witnesses. • ______________—inclusion of date, time, scale, reference points, distance measurements, names of investigators, victims, suspects, and a legend (key) • _________________—allows narration (non-subjective) to be included Kendall/Hunt Publishing Company

  10. SEARCH METHODS • _________________in large, outdoor scenes • __________—basically a double-line search; effective, but time-consuming • __________—most effective in houses or buildings; teams are assigned small zones for searching • ________________on small, circular crime scenes • ____________—may move inward or outward; best used where there are no physical barriers Kendall/Hunt Publishing Company

  11. SEARCH METHODS Kendall/Hunt Publishing Company

  12. CRIME SCENE SKETCH Date: August 14, 2005 Criminalist: Ann Wilson Time: 11:35 am Location: 4358 Rockledge Dr, St. Louis, Mo. Scale info N Birds-eye view (shown) or Elevation Sketches ______and _____ attention to relevant items Kendall/Hunt Publishing Company

  13. COLLECTING AND PACKAGING EVIDENCE • One individual should be designated as the evidence collector to ensure that the evidence is collected, packaged, marked, sealed, and preserved in a consistent manner • Each item must be placed in a __________ container, ___________, and ___________ with ____________________________________________________________________________________________ • Most fragile is collected and packaged first • Different types of evidence require specific or special collection and packaging techniques • The body is the property of the coroner or medical examiner. The collection of evidence on the body is usually done by that department but may be done by scientists Kendall/Hunt Publishing Company

  14. PACKAGING Most items should be packaged in a primary container and then placed inside a secondary one. These are then placed inside other containers such as paper bags, plastic bags, canisters, packets and envelopes depending on the type and size of the evidence. Biological evidence ___________________________ Kendall/Hunt Publishing Company

  15. CHAIN OF CUSTODY There must be _____________________________________________________________________________________________________________________ • The evidence container must be marked for identification • The collector’s initials, time, and date should be placed across the seal • If evidence is turned over to another person, the transfer must be recorded. Kendall/Hunt Publishing Company

  16. CRIME SCENE RECONSTRUCTION Stages reflect scientific method • O: Detect/collect evidence and data • H: State hypothesis • E: Examine, test, analyze, experiment • C: Conclude/form theory Kendall/Hunt Publishing Company

  17. THE MEDICAL EXAMINER AND THE CORONER • A medical examiner is a medical doctor, usually a pathologist and is appointed by the governing body of the area. There are 400 forensic pathologists throughout the U.S. • A coroner is an elected official who usually has no special medical training. In four states, the coroner is a medical doctor. Kendall/Hunt Publishing Company

  18. MEDICAL EXAMINER’S RESPONSIBILITIES • Identify the deceased • Establish the time and date of death • Determine a medical cause of death—the injury or disease that resulted in the person dying • Determine the mechanism of death—the physiological reason that the person died • Classify the manner of death • Natural • Accidental • Suicide • Homicide • Undetermined • Notify the next of kin Kendall/Hunt Publishing Company

  19. MORE INFORMATION For additional information on crime scene investigation, check out Court TV’s Crime Library: www.crimelibrary.com/criminal_mind/forensics/crimescene/5.html On Michael Baden and the autopsy: www.crimelibrary.com/criminal_mind/forensics/autopsy/1.html Kendall/Hunt Publishing Company

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