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Crime Scene Processing Detective Gerry Durand  (ret.)
Disclaimer <ul><li>The photographs you are about to see are actual crime scene photographs.  These photos and the accompan...
Functions of BCI Division <ul><li>Processing of Crime Scene </li></ul><ul><li>Processing of Prisoners </li></ul><ul><li>Re...
Processing of Prisoners <ul><li>Demographics </li></ul><ul><ul><li>name, sex, height, weight, employment </li></ul></ul><u...
<ul><li>Forensics </li></ul><ul><ul><li>the application of science to matters of law </li></ul></ul><ul><ul><li>Physical E...
Processing Crime Scene <ul><li>Document Scene </li></ul><ul><ul><li>Notes </li></ul></ul><ul><ul><li>Photography </li></ul...
Notes <ul><li>Chronological Order </li></ul><ul><li>Step by step </li></ul><ul><li>Complete and thorough </li></ul><ul><li...
Crime Scene Search <ul><li>Survey the scene </li></ul><ul><li>Photographing and sketching </li></ul><ul><ul><li>Measuring ...
Search Patterns <ul><li>4 types </li></ul><ul><ul><li>Quadrant (indoor) </li></ul></ul><ul><ul><li>Grid (outdoor) </li></u...
Diagramming <ul><li>Shows a two-dimensional picture of a three-dimensional scene </li></ul><ul><li>Eliminates extraneous i...
Diagramming <ul><li>Reference Point *absolutely needed* </li></ul><ul><ul><li>An engineered object (measured and recorded)...
Diagramming <ul><li>Measuring </li></ul><ul><ul><li>Baseline </li></ul></ul><ul><ul><li>Triangulation </li></ul></ul><ul><...
Needed on the sketch <ul><li>Reference Point </li></ul><ul><li>Orientation </li></ul><ul><li>Case Information </li></ul><u...
 
N->
Photographing the scene <ul><li>Point of entry </li></ul><ul><li>All corners of the room </li></ul><ul><li>ceiling </li></ul>
Photography   35mm vs. Digital <ul><li>35mm </li></ul><ul><ul><li>Actual Negative (harder to change) </li></ul></ul><ul><u...
 
 
 
Video <ul><li>Real-time </li></ul><ul><li>Moves around objects </li></ul><ul><li>Zoom and wide angle </li></ul><ul><li>Qui...
Seizing Evidence <ul><li>Pitfalls  </li></ul><ul><ul><li>Documentation </li></ul></ul><ul><ul><li>chain of custody </li></...
Trace Evidence <ul><li>Blood (Luminol) </li></ul><ul><li>Semen </li></ul><ul><li>Hairs and Fibers </li></ul><ul><li>Saliva...
 
 
 
Order of Tasks at a Crime Scene <ul><li>Aid to Victim </li></ul><ul><li>Search for additional victims and suspects </li></...
What can be touched at the Crime Scene <ul><li>NOTHING </li></ul>
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Msc crime scene processing

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Lecture minus the crime scene photos

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  • Transcript of "Msc crime scene processing"

    1. 1. Crime Scene Processing Detective Gerry Durand (ret.)
    2. 2. Disclaimer <ul><li>The photographs you are about to see are actual crime scene photographs. These photos and the accompanying discussions are very graphic and may be disturbing to some people. To respect the privacy of the victims, actual addresses and some details have been changed. </li></ul>
    3. 3. Functions of BCI Division <ul><li>Processing of Crime Scene </li></ul><ul><li>Processing of Prisoners </li></ul><ul><li>Registering Sex Offenders </li></ul><ul><li>Miscellaneous Duties </li></ul><ul><ul><li>ID’s </li></ul></ul><ul><ul><li>Fingerprinting for firearms and Child Care </li></ul></ul><ul><ul><li>Background checks for employment </li></ul></ul>
    4. 4. Processing of Prisoners <ul><li>Demographics </li></ul><ul><ul><li>name, sex, height, weight, employment </li></ul></ul><ul><li>Fingerprints </li></ul><ul><li>Mug Shot </li></ul>
    5. 5. <ul><li>Forensics </li></ul><ul><ul><li>the application of science to matters of law </li></ul></ul><ul><ul><li>Physical Evidence </li></ul></ul><ul><ul><ul><li>Anything that tends to establish or disprove a fact </li></ul></ul></ul>
    6. 6. Processing Crime Scene <ul><li>Document Scene </li></ul><ul><ul><li>Notes </li></ul></ul><ul><ul><li>Photography </li></ul></ul><ul><ul><li>Video </li></ul></ul><ul><ul><li>Diagram </li></ul></ul><ul><li>Collection of Evidence </li></ul><ul><li>Fingerprints </li></ul><ul><li>Specific Tasks </li></ul><ul><ul><li>Blood Spatter </li></ul></ul><ul><ul><li>Bullet Trajectory </li></ul></ul>
    7. 7. Notes <ul><li>Chronological Order </li></ul><ul><li>Step by step </li></ul><ul><li>Complete and thorough </li></ul><ul><li>Legibly </li></ul><ul><li>Negative or unexpected conditions </li></ul><ul><li>Be as specific as possible </li></ul>
    8. 8. Crime Scene Search <ul><li>Survey the scene </li></ul><ul><li>Photographing and sketching </li></ul><ul><ul><li>Measuring evidence </li></ul></ul><ul><li>Locard’s Theory </li></ul><ul><ul><li>Every contact leaves a trace </li></ul></ul><ul><ul><li>Anytime someone or something enters a crime scene, they alter it in some way (depositing or removing evidence) </li></ul></ul>
    9. 9. Search Patterns <ul><li>4 types </li></ul><ul><ul><li>Quadrant (indoor) </li></ul></ul><ul><ul><li>Grid (outdoor) </li></ul></ul><ul><ul><li>Strip or line (large # of personnel) </li></ul></ul><ul><ul><li>Spiral (alone) </li></ul></ul>
    10. 10. Diagramming <ul><li>Shows a two-dimensional picture of a three-dimensional scene </li></ul><ul><li>Eliminates extraneous items that have limited evidentiary value </li></ul>
    11. 11. Diagramming <ul><li>Reference Point *absolutely needed* </li></ul><ul><ul><li>An engineered object (measured and recorded) </li></ul></ul><ul><ul><ul><li>Building </li></ul></ul></ul><ul><ul><ul><li>Manhole Cover/fire hydrant </li></ul></ul></ul><ul><ul><ul><li>Road/ curbing </li></ul></ul></ul><ul><ul><ul><li>Telephone pole </li></ul></ul></ul><ul><ul><ul><li>Large Tree/Rock </li></ul></ul></ul><ul><ul><ul><ul><li>What if there is no point </li></ul></ul></ul></ul>
    12. 12. Diagramming <ul><li>Measuring </li></ul><ul><ul><li>Baseline </li></ul></ul><ul><ul><li>Triangulation </li></ul></ul><ul><li>Sketching </li></ul><ul><li>Final Sketch </li></ul>
    13. 13. Needed on the sketch <ul><li>Reference Point </li></ul><ul><li>Orientation </li></ul><ul><li>Case Information </li></ul><ul><ul><li>Case number </li></ul></ul><ul><ul><li>Name of suspect/victim/investigator/author </li></ul></ul><ul><ul><li>Date/time </li></ul></ul><ul><li>Scale </li></ul><ul><li>Legend </li></ul>
    14. 15. N->
    15. 16. Photographing the scene <ul><li>Point of entry </li></ul><ul><li>All corners of the room </li></ul><ul><li>ceiling </li></ul>
    16. 17. Photography 35mm vs. Digital <ul><li>35mm </li></ul><ul><ul><li>Actual Negative (harder to change) </li></ul></ul><ul><ul><li>Jury is familiar with it </li></ul></ul><ul><ul><li>Familiar Camera </li></ul></ul><ul><ul><li>Permanent record (hard drive crashes) </li></ul></ul><ul><li>Digital </li></ul><ul><ul><li>Quick turn-around time </li></ul></ul><ul><ul><li>Easy to change lighting, contrast </li></ul></ul><ul><ul><li>Don’t have to worry about developing sensitive photos </li></ul></ul>
    17. 21. Video <ul><li>Real-time </li></ul><ul><li>Moves around objects </li></ul><ul><li>Zoom and wide angle </li></ul><ul><li>Quick </li></ul><ul><li>Blair witch effect </li></ul><ul><li>Sound </li></ul>
    18. 22. Seizing Evidence <ul><li>Pitfalls </li></ul><ul><ul><li>Documentation </li></ul></ul><ul><ul><li>chain of custody </li></ul></ul><ul><ul><li>contaminating evidence </li></ul></ul>
    19. 23. Trace Evidence <ul><li>Blood (Luminol) </li></ul><ul><li>Semen </li></ul><ul><li>Hairs and Fibers </li></ul><ul><li>Saliva </li></ul><ul><li>Fingerprints </li></ul><ul><li>Alternate Light Source </li></ul><ul><ul><li>uses different wavelengths of visible light to “fluoresce” items for easier viewing </li></ul></ul>objects or substances contacting one another, and leaving a minute sample on the contact surfaces
    20. 27. Order of Tasks at a Crime Scene <ul><li>Aid to Victim </li></ul><ul><li>Search for additional victims and suspects </li></ul><ul><li>Separate Witnesses </li></ul><ul><li>Establish a perimeter </li></ul><ul><li>Do NOT allow victims or suspects back in the crime scene </li></ul>
    21. 28. What can be touched at the Crime Scene <ul><li>NOTHING </li></ul>
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