Forensic Science HAIR AND FIBER ANALYSIS.

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Presentation transcript:

Forensic Science HAIR AND FIBER ANALYSIS

Forensic Science Natural fibers Plant & Animal

Plant: Animal: Linen (flax) & cotton Silk, hair, fur & wool Natural Fibers Forensic Science Plant: Linen (flax) & cotton Animal: Silk, hair, fur & wool

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

Whole Fabric Traits - Color - Texture - Weight Natural Fibers Forensic Science Whole Fabric Traits - Color - Texture - Weight

Fiber Analysis - Tests Absorbancy Test: does it absorb water or Natural Fibers Forensic Science Fiber Analysis - Tests Absorbancy Test: does it absorb water or repel it?

Fiber Analysis - Tests Burn Test: moves away from flame. Natural Fibers Forensic Science Fiber Analysis - Tests Burn Test: moves away from flame. smells like singed hair. burns to ash.

Fiber Analysis - Tests Elasticity Test: how much can it be stretched? Natural Fibers Forensic Science Fiber Analysis - Tests Elasticity Test: how much can it be stretched?

Hair, Fur & Wool Forensic Science Skin cross- section

Hair Cross-section Forensic Science

Hair Cross-section Forensic Science

Light Colored Hair Forensic Science

Medulla Patterns Forensic Science

Your Analysis? Forensic Science

Pigment Patterns Forensic Science

Pigment Patterns Forensic Science

Cuticle Forensic Science Scale Patterns

Scale Patterns Forensic Science

Your Analysis? Forensic Science Hair Analysis

Your Analysis? Forensic Science

Your Analysis? Forensic Science

Hair Root Patterns Forensic Science

Hair Root Patterns Forensic Science

Forensic Science Synthetic fibers

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

Polyester (Dacron & Duroflex) Nylon (Polyamide) Acrylic Moire Synthetic Fibers Forensic Science Polyester (Dacron & Duroflex) Nylon (Polyamide) Acrylic Moire Polypropylene (Olefin)

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

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

Submission Protocol Forensic Science 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.

Tape Tweezers Vacuum Undress Over Sheet Other? Collection Methods Forensic Science Tape Tweezers Vacuum Undress Over Sheet Other? Follicular Tag Synthetics Mass Spec Tape Lift

Hair & Fibers Forensic Science The End