Crime Scene Investigation


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Crime Scene Investigation

  1. 1. Crime SceneInvestigation
  2. 2.  To document and process a crime scene through photography, sketching and note- taking.OBJECTIVE
  3. 3.  Camera Computer Paper Writing utensilsMATERIALS
  4. 4.  Do not contaminate the crime scene!SAFETY
  5. 5.  Make tent cards and number them to mark all evidence located on the crime scene. Once you have been separated into groups I will tell you how many tent cards your group will make. Do NOT begin making cards until you have been told how many to make!!!Tent Cards – Marking Evidence
  6. 6.  Record a pictorial view of the scene. Record items of evidence. One person in your group may pull out their phone to take photographs of the crime scene. Make sure I check them before you move on.Photograph the Scene
  7. 7.  A rough sketch should be completed by the crime scene technician to demonstrate the layout of the crime scene and to identify the exact position of the deceased victim or evidence within the crime scene. Make sure ALL requirements are included on your sketch, just like the sketch you did last week.Sketch the Scene
  8. 8.  Must provide all the details necessary to complete a finished drawing Must identify every object in the room Need to be to scale Needs to have measurements (have someone in your group verify this). Needs to be marked “N” for North to orient the drawing Needs a legend to explain any symbols that are used to identify various objects (In small areas, various objects may be lettered or numbered and keyed in the legend)Sketch the Scene
  9. 9.  In this case and at this crime scene, the note taker has two jobs. ◦ The first job is taking notes over crime scene. Make notations over placement of objects, the position of the body, blood spatters, bugs or insects that are on the body, etc. Anything and everything is note-worthy. ◦ The more detailed your notes are, the better off you are. ◦ The notes taken will help to reconstruct the crime scene after it is longer available to you. ◦ Notes should contain any of your own thoughts and any “memory joggers” that will help you remember the specifics about the case. ◦ Be sure to work closely with the crime scene sketcher and the photographer so that nothing is missed. ◦ Notes need to be typed up and placed in the file so that they do not get lost. They are a very important permanent record about the crime scene.Note-taking
  10. 10.  The second job is that you will do is provide leadership for your team. You will be the one who assists the sketcher on double- checking measurements. You will be the one to question the photographer to make sure that all the evidence, strange marks, or footprints were photographed. Once the POE has been established, photographs have been taken, and notes have been written, it will be your responsibility to make sure that your evidence collector does a thorough and proper job. If asked, you will be the one who holds the envelope while the evidence is placed into it.Note-taking
  11. 11.  Name – Deaundre Jackson D.O.B – 11.21.64 Race – Black and Hispanic Height – 5’10” Weight – 182 lbs. Occupation – TeacherVictim’s Information
  12. 12.  Blood spatter on the east wall belonged to the victim. ◦ It is reported to be the initial blow. Blood found on the floor near the yellow student desk belonged to the victim.Bodily Fluids
  13. 13.  It is the victim’s blood on the hole- puncher. Blood smear near the hole-puncher is the victim’s.Bodily fluids (Victim)
  14. 14.  Hair belonged to the victim on the hole- puncher.Trace Evidence
  15. 15.  Fingerprints found on the hole puncher did NOT belong to the victim. Fingerprint found on the paper towel dispenser did not belong to the victim or the f.p. found on the hole puncherFingerprints
  16. 16.  Victim died of blunt force trauma to the head. Hole-puncher was determined to be the murder weapon due to the impression left on the posterior side of the skull. T.O.D. – estimated at 11:00pm (which suggested watch was broken during the struggle)Injury Report
  17. 17.  Blood spatter (puddle) near the victim was the victim’s blood Trail of blood near the victim did NOT belong to him. Blood and skin was found under the victim’s nails on his right hand. Saliva was discovered on the cell phone. DNA from the saliva, blood trail, and skin found under the nails ALL came from the same person.Bodily Fluids (Suspect)
  18. 18.  Note: “Have interesting new info. See you tonight. Dion” Handwriting does not match that of signatures from the victim.Questioned Document Analysis
  19. 19.  Dion Jackson – step brother of Deaundre. D.O.B. – 5.13.79 Race – Black American Height – 5’11” Weight – 200 lbs Unknown bodily fluids and skin (found under the nails of victim) matched this suspect’s DNASuspect #1 Information
  20. 20.  Dion Carter– co-worker of Deaundre D.O.B. – 10.12.77 Race – Black American Height – 5’10.5” Weight – 210 lbs Fingerprint on the paper towel dispenser matched this suspect’s printsSuspect #2 Information
  21. 21.  Crime scene reconstruction is the use of scientific methods, physical evidence, deductive reasoning, and their interrelationships to gain explicit knowledge of the series of events that surround the commission of a crime. It is a disciplined and principled approach towards objectively understanding a crime scene. Using evidence found at a crime scene the incident can be reconstructed to determine what happened, and possibly find more clues.Crime Scene Reconstruction
  22. 22.  Specific Incident Reconstruction (Traffic Accident, Homicide, Bombing, etc.). Specific Event Reconstruction (Sequence, Direction, Condition, Relation, Identity). Specific Physical Evidence Reconstruction (Firearms, Blood, Glass etc.).Types of Crime SceneReconstruction
  23. 23.  The pattern selected will normally depend on the size and locale of the scene and the number of collectors participating in the search.Crime Scene Search Patterns
  24. 24. Spiral Search Method
  25. 25. Grid Pattern
  26. 26. Quadrant/Zone Pattern
  27. 27.  Moving up and down in a straight line through the crime sceneStrip/Line Pattern