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Forensic Science. HAIR AND FIBER ANALYSIS. Forensic Science. Natural fibers. Plant & Animal. Natural Fibers. Forensic Science. Plant : Linen (flax) & cotton Animal : Silk, hair, fur & wool. Natural Fibers. Forensic Science. Cellulose Based Fibers Manufactured, but from natural

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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