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Forensic Science

Forensic Science

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Forensic Science

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Presentation Transcript

  1. ForensicScience HAIR AND FIBER ANALYSIS

  2. ForensicScience Natural fibers Plant & Animal

  3. Natural Fibers ForensicScience Plant: Linen (flax) & cotton Animal: Silk, hair, fur & wool

  4. Natural Fibers ForensicScience Cellulose Based Fibers Manufactured, but from natural fiber materials. - Rayon (1910) - Acetate (1924)

  5. Natural Fibers ForensicScience Whole Fabric Traits - Color - Texture - Weight

  6. Natural Fibers ForensicScience • Fiber Analysis - Tests • Absorbancy Test: • does it absorb water or • repel it?

  7. Natural Fibers ForensicScience • FiberAnalysis - Tests • Burn Test: • moves away from flame. • smells like singed hair. • burns to ash.

  8. Natural Fibers ForensicScience • FiberAnalysis - Tests • Elasticity Test: • how much can it be • stretched?

  9. Hair, Fur & Wool ForensicScience Skin cross- section

  10. Hair Cross-section ForensicScience

  11. Hair Cross-section ForensicScience

  12. Light Colored Hair ForensicScience

  13. Medulla Patterns ForensicScience

  14. Your Analysis? ForensicScience

  15. Pigment Patterns ForensicScience

  16. Pigment Patterns ForensicScience

  17. Cuticle ForensicScience Scale Patterns

  18. Scale Patterns ForensicScience

  19. Your Analysis? ForensicScience Hair Analysis

  20. Your Analysis? ForensicScience

  21. Your Analysis? ForensicScience

  22. Hair Root Patterns ForensicScience

  23. Hair Root Patterns ForensicScience

  24. ForensicScience Synthetic fibers

  25. Synthetic Fibers ForensicScience Man-made from petroleum products or other chemicals. No medulla or scale patterns.

  26. Synthetic Fibers ForensicScience Polyester (Dacron & Duroflex) Nylon (Polyamide) Acrylic Moire Polypropylene (Olefin)

  27. Synthetic Fibers ForensicScience Fiber Analysis Burn Test: - Will tend to melt. - Solidify when cooled. - Give off unpleasant odor. - Give off toxic vapor.

  28. Submission Protocol ForensicScience FABRIC: When possible, submit the entire garment or textile. Submit fibers in clean paper or an envelope with sealed corners.

  29. Submission Protocol ForensicScience HAIRS: Collect at least 25 known hairs from different parts of the head and/or pubic region. Comb and pull out the hairs. Submit hairs in clean paper or envelope with sealed corners.

  30. Collection Methods ForensicScience • Tape • Tweezers • Vacuum • Undress Over Sheet • Other? Follicular Tag Synthetics Mass Spec Tape Lift

  31. Hair & Fibers ForensicScience The End