2. Categories Hair and fiber (often studied together as hairs often make fibers… ex. Wool) Fire and explosive residues Glass Soil

3. Fibers: Natural Cotton Linen Hemp Wool Silk

4. FLAX: with polarized light

5. Man made (Synthetic) More than half of common fibers Polyester and Nylon are most common

6. Cross- section view Sometimes manufacturer specific Unusual forms more significant forensically

7. How valuable is a fiber? How the dye is applied, absorbed, and fades more important than color itself How MANY fibers that match are considered WHERE the fiber is found on the body can be significant

8. FABRICS: Which is more likely to leave transfer evidence? TaffetaFiberglassX

9. New? Worn in? X

10. Fabric Source It is not possible to say positively that a fiber originated from a particular fabric. WHY? The wide variety of fiber types, fiber colors, and fabric types can make fiber associations very significant.

11. Most common fibers of all? white cotton fibers and blue cotton fibers like those comprising blue jeans

12. Types of transfer Direct transfer (primary transfer) or indirect transfer (secondary transfer)

13. Fiber Evidence: Assigning Significance Matching dyed synthetic fibers or dyed natural fibers can be very meaningful, whereas the matching of common fibers such as white cotton or blue denim cotton would be less significant

14. When a fiber examiner matches a questioned fiber to a known item of clothing, there are only two possible explanations: The fiber actually originated from the item of clothing, or The fiber did not originate from the item of clothing.

15. Important pieces of evidence fingerprints hair

16. fibers Tissue/blood

17. fibers

18. Trapped tissue

19. Hair in hand of suspect/victim

20. Comparisons Thorough random samples should be taken from the head and pubic regions of a suspect(s) and victim(s). Twenty-five full-length hairs, pulled and combed from different areas of the head and pubic regions, are generally considered an adequate representation of an individual's hair characteristics

21. Weapons Trace before fingerprints

22. ???

23. A C B D

24. Animal hair Cotton Human hair Nylon

27. One study…….

30. Residue on hair

31. Analysis