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THE CRIME SCENE

THE CRIME SCENE. PROCESSING THE CRIME SCENE. DEFINING A CRIME SCENE. Primary Crime Scene Secondary Crime Scene Macroscopic Microscopic. PHYSICAL EVIDENCE. Relation between VICTIM SUSPECT SCENE OBJECTS PHYSICAL EVIDENCE. INFORMATION FROM EVIDENCE. VERIFY STATEMENTS

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THE CRIME SCENE

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  1. THE CRIME SCENE

  2. PROCESSING THE CRIME SCENE

  3. DEFINING A CRIME SCENE • Primary Crime Scene • Secondary Crime Scene • Macroscopic • Microscopic

  4. PHYSICAL EVIDENCE • Relation between • VICTIM • SUSPECT • SCENE • OBJECTS • PHYSICAL EVIDENCE

  5. INFORMATION FROM EVIDENCE • VERIFY STATEMENTS • IDENTIFICATION OF SUSPECTS • AFIS, CODIS • SUBSTANCE IDENTIFICATION • DRUGS, ACCELERANTS, • SCENE RECONSTRUCTION • INVESTIGATIVE LEADS

  6. LOCARD’S EXCHANGE PRINCIPLE • Whenever two objects come into contact, a mutual exchange of matter will take place between them.

  7. SCIENTIFIC METHOD • METHODOLOGICAL • SYSTEMATIC • LOGICAL • APPLICATION OF KNOWLEDGE

  8. CRIME SCENE MANAGEMENT • ABILITY TO SOLVE CRIME A TEAM EFFORT • INFORMATION MANAGEMENT • MANPOWER MANAGEMENT • TECHNOLOGY MANAGEMENT • LOGISTICS MANAGEMENT

  9. FIRST RESPONDERS • Assist the victim • Search for / arrest suspect • Detain witnesses / keep separate • PROTECT CRIME SCENE / LOG • DO NOT SMOKE, DRINK OR EAT • Infect self • Contaminate scene • Communicate all information to detectives

  10. CRIME SCENE PROCEDURES • SECURE SCENE • SURVEY SCENE • Minimize contact by ALL personnel • Use Personal Protective Equipment • Note evidence • Protect evidence that may be lost • Note weather conditions • Use alternate entry • Record EVERYTHING

  11. APPROACH THE SCENE

  12. SECURE AND PROTECT THE SCENE

  13. PRELIMINARY SURVEYOF THE SCENE

  14. NARRATIVE: DESCRIPTION OF THE SCENE

  15. CRIME SCENE DOCUMENTATION • NOTES • VIDEO • PHOTOGRAPHY • SKETCHES

  16. CRIME SCENE DOCUMENTATION • NOTES • Immediate • Accurate • Continuing • VIDEO • 3D Documentation of scene • Orientation of scene but no narrative • DO NOT EDIT

  17. PHOTOGRAPH THE SCENE

  18. CRIME SCENE DOCUMENTATION • PHOTOGRAPHY • BEFORE MOVING EVIDENCE • SYSTEMATIC • OVERVIEW • MIDRANGE • CLOSE-UP • LOG / CAMERA SETTINGS • SCALE

  19. Three Types of Photographs • 1. Overall • 2. Midrange • 3. Closeup

  20. CRIME SCENE DOCUMENTATION • SKETCHES • Assign measurements to objects • Triangulation • Baseline • Polar Coordinates • Rough / finished • Legend

  21. SKETCH THE SCENE

  22. Rough Sketch

  23. Finished Sketch

  24. CRIME SCENE SEARCH • SYSTEMATIC / METHODICAL • LINE • GRID • ZONE • WHEEL • SPIRAL

  25. Search Patterns

  26. EVALUATION OF THE PHYSICAL EVIDENCE AT THE SCENE

  27. COLLECTION & PRESERVATION OF PHYSICAL EVIDENCE • One CSI in charge • Priority to easily destroyed evidence • Primary packaging • Contain and protect • Secondary packaging • Seal and tamper resistant • INITIAL / DATE / TIME • Identity of item enclosed

  28. Evidence Bindles

  29. DETAILED SEARCH OF THE SCENE

  30. COLLECTION & PRESERVATION OF PHYSICAL EVIDENCE • Each item separate • Wet items • Temporary in plastic • Air Dry • Permanent in paper • Arson evidence – air tight containers • Controls

  31. COLLECTION, RECORDING, MARKING AND PRESERVATION OF EVIDENCE • What constitutes a seal? • Initials on article or container • Description of contents • Paper is our friend! • Evidence Bindle

  32. PROCESS THE SCENE FOR LATENT PRINTS AND COLLECT ANYPRINTS DEVELOPED

  33. CRIME SCENE RECONSTRUCTION • Data Collection • Conjecture • Hypothesis Formulation • Testing • Theory

  34. FINAL SURVEY!!! STOP AND THINK OF ANYTHING FURTHER THAT MIGHT BE COLLECTED.

  35. RELEASE OF THE CRIME SCENE

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