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