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Enhancing Observational Skills and Brain Processing in Forensic Investigations

Explore the factors influencing observations, brain processing, and eyewitness reliability in forensic science. Understand the importance of collecting and analyzing evidence at crime scenes. Learn about the roles of forensic investigators, identification of physical evidence, fingerprint analysis, and the significance of the Chain of Custody. Gain insights into the patterns of fingerprints, tire impressions, and the importance of accurate documentation.

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Enhancing Observational Skills and Brain Processing in Forensic Investigations

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Presentation Transcript

  1. FS Fall Final Review

  2. Ch 1 and 2observations and CSI • What factors affect our observations? • How does the brain process information? • How could you become a better eyewitness?

  3. Forensic investigators recognize, document, collect, and organize evidence left at the scene of a crime. Factors that affect observational skills such as emotion, perception and recall,time of day, level of interest, number of people…

  4. How does your brain work?

  5. Your brain… • Filters (what is important, what you notice, your level of interest, who you are with, where you are….) • Fills in gaps (you may think you saw it…) • Applies previous knowledge (you sort out issues based on what you know)

  6. Direct vs Indirect

  7. Physical Evidence

  8. Trace

  9. Who does what? • Who secures the scene and separates witnesses? • Who takes measurements and notes location of evidence • Who interviews the witnesses

  10. First Find, then

  11. Why secure the scene?

  12. Identify the regions of hair

  13. What part of the hair is shown?

  14. DNA?

  15. Human or NON-human Cuticle?

  16. Consistent? Dissimilar?Inconclusive?

  17. Is Hair CLASS or INDIVIDUAL evidence?

  18. Medulla

  19. Locard • Every contact leaves a trace • Duration • Intensity • Materials used

  20. Control?

  21. Fingerprint Minutiae

  22. Fingerprints • Alphonse Bertillion • Anthropometry-use of body measurements for identification • Francis Galton-suggested 3 categories-Arches, loops and whorls • 1999 – US v. Byron C. Mitchell-case that provided 3 principles of fprint • 1. unique • 2. unchanging • 3. can be used to ID individuals

  23. Kinds of Crime Scene Prints Patent /Visible prints – made by fingers touching a surface after ridges have been in contact with a colored materials (blood, paint, etc.) Plastic Prints – ridge impressions left on a soft material (putty, wax, soap or dust) Latent/invisible prints – caused by the transfer of perspiration/oils on finger ridges to the surface of an object

  24. Identify each fingerprint pattern. ? A B Right Hand Left Hand C Right Hand E D Right Hand Left Hand

  25. How can we use these?

  26. What Can be learned from tire impressions? • What type of impression is shown?

  27. What can you learn from studying the gait (walking pattern)

  28. Why is Chain of Custody so important?

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