Chapter Twelve – Forensic Hair Examinations - PowerPoint PPT Presentation

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Chapter Twelve – Forensic Hair Examinations

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  1. Chapter Twelve – Forensic Hair Examinations FRSC 7104 Criminalistics I Professor Bensley

  2. FRSC 7104 – Hair Analysis Objectives After studying this chapter, the student should be able to:  Recognize the macro- and micro-structure of hair  Understand how body area determinations are made  Describe how ancestral estimation and hair damage, disease, and treatment play a role in forensic hair examinations  Understand how forensic hair examinations are conducted and recognize the role of mtDNA in this process

  3. FRSC 7104 – Hair Analysis Outline • Introduction and History • Hair Types • Basic Hair Morphology

  4. FRSC 7104 – Hair Analysis Outline

  5. Basic Hair Morphology

  6. FRSC 7104 – Hair Analysis Outline • Cuticle Imbricate Coronal Spinous

  7. Bat Hair – Coronal Scales Mink Hair – Spinous Scales Human Hair – Imbricate Scales

  8. FRSC 7104 – Hair Analysis Outline • Cortex Human Hair - Cortical Fusi

  9. Ovoid Bodies Clockwise starting at top left – Cow hair, Dog Hair, Human Hair

  10. Pigment Distribution Clockwise starting at top left – Human hair, red human hair, animal hair

  11. FRSC 7104 – Hair Analysis Outline • Medulla Uniserial Ladder Medulla – Rabbit Hairs Multiserial Ladder Medulla -Rabbit Hairs

  12. Hair From Deer Family

  13. FRSC 7104 – Hair Analysis Outline • Hair Growth and Replacement • Phases of Growth

  14. FRSC 7104 – Hair Analysis Outline • Identification of Hair • Animal or Human? • Racial Characteristics • Caucasoid (European) • Negroid (African) • Mongoloid (Asian)

  15. Caucasian Head Hair

  16. Negroid Head Hair

  17. Mongoloid Head Hair

  18. FRSC 7104 – Hair Analysis Outline • Somatic Origin (Area of Body) • Pubic Hair

  19. FRSC 7104 – Hair Analysis Outline • Limb Hair

  20. FRSC 7104 – Hair Analysis Outline • Beard Hair

  21. FRSC 7104 – Hair Analysis Outline • Hair Comparisons • Sources of Variation

  22. Single Head Hair

  23. Tips of Hairs

  24. Hair Roots

  25. Dyed and Bleached Human Hair

  26. Damaged Hairs

  27. Diseased Hairs

  28. FRSC 7104 – Hair Analysis Outline • Collection and Comparison of Hair Evidence • Conclusions of Microscopic Hair Analysis • DNA Evaluation and Examination

  29. Chapter Summary • Hairs are among the most often collected and potentially useful types of trace evidence • Microscopical comparisons and mitochondrial DNA yield information