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Processing the Crime Scene

Processing the Crime Scene. Ultimate Goal. Successful presentation of evidence Lost evidence Locard’s Princple. Processing the Crime Scene. Evaluate the scene. Is it safe? Are there injuries? Has the perpetrator left?. Processing the Crime Scene. Secure and Isolate the Scene.

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Processing the Crime Scene

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  1. Processing the Crime Scene

  2. Ultimate Goal • Successful presentation of evidence • Lost evidence • Locard’s Princple Processing the Crime Scene

  3. Evaluate the scene • Is it safe? • Are there injuries? • Has the perpetrator left? Processing the Crime Scene

  4. Secure and Isolate the Scene • Protect the integrity of the scene • Establish jurisdiction • Establish exit & entrance • Establish crime scene perimeter • Isolate witnesses Processing the Crime Scene

  5. Conduct preliminary survey • Walk through scene – hands in pockets • Determine evidence • Label evidence Processing the Crime Scene

  6. Record the scene • Video • Begin with case #, date, location • Begin with surroundings (include entrance/exits) • Tape Evidence (wide angle, close-up) • Victims viewpoint • Photographs • Wide angle • Close ups • Include scale Processing the Crime Scene

  7. Record the Scene: Sketches • Dimension • Distance • Context • Relationships among items of evidence • Types of sketches • Overhead • Exploded View • Elevation • Perspective Processing the Crime Scene

  8. X Y X Y X Y 30° e e e Triangulation Baseline Polar Coordinates Record the Scene: Sketches Processing the Crime Scene

  9. Processing the Crime Scene

  10. Photographs Processing the Crime Scene

  11. Photographs Processing the Crime Scene

  12. Processing the Crime Scene

  13. Record the Scene: Notes • Describe the crime scene • Location of physical evidence • Description of evidence • Location, time collection, who • Disposition of physical evidence after collection • Thorough/Complete/Descriptive/Accurate Processing the Crime Scene

  14. What is evidence? • Any material, mark or sign, living or inanimate, solid, liquid or gas, which can be used as proof that a crime has or has not been committed or connects a perpetrator with a crime or crime scene. Processing the Crime Scene

  15. Systematic search for evidence • 3-D • Outside-In • Line • Grid Processing the Crime Scene

  16. Collection of evidence • Paper for biological evidence • Plastic for non-biological evidence • Metal or glass for flammables • Record, mark and preserve • Chain of custody Processing the Crime Scene

  17. Collection of evidence • Separate containers • Pill containers • Powders • Bloodstains • Clothing • Charred debris Processing the Crime Scene

  18. Collection of control samples • Exemplars • K • Hair samples • Paint • Blood • Soil • Fingerprints Processing the Crime Scene

  19. Review 1) Is the scene safe? 2) Do a survey/walk through • Evidence recognition 3) Conduct a scene search for more evidence 4) Number evidence 4) Document the scene • Photos, video, sketch 5) Collect and preserve the evidence 6) Release the scene

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