1. Hair as Evidence
What can it do for us?

3. Why Hair? One of the most common pieces of evidence Burned hair
Hair from a child is examined for drugs

4. History of Hair Analysis
* Alfred Swaine Taylor and Thomas Stevenson
*1883
*forensic science text that included a chapter on hair

5. History of Hair Analysis
Victor Balthazard, professor of forensic medicine at the Sorbonne, with Marcelle Lambert (1910)
First comprehensive hair study, Le poil de l'homme et des animaux.
Rabbit hair
Bat hair
Badger hair

6. History of Hair Analysis
1910- Murder of Germaine Bichon
Rosella Rousseau confessed only after confronted with hair as evidence.
Hair found under Bichon’s fingernails.
What are the possible limitations of using hair as evidence in a crime investigation?

7. For Discussion
What are the possible advantages of using hair evidence?
What reasons might have prevented investigators from using hair in investigations before 1910?
What kinds of technology advances have made it possible for investigators to use hair as evidence?

8. For Discussion
What are the possible advantages of using hair evidence?
What reasons might have prevented investigators from using hair in investigations before 1910?
What kinds of technology advances have made it possible for investigators to use harir as evidence?

9. For Discussion
What are the possible advantages of using hair evidence?
What reasons might have prevented investigators from using hair in investigations before 1910?
What kinds of technology advances have made it possible for investigators to use hair as evidence?

10. Comparison Microscope
Dr. Sydney Smith, in 1934, first used a comparison microscope to analysis hairs side by side.
Helped to solve murder
case.

11. Neutron Activation Analysis
Bombard sample with neutrons
Sample spontaneously emits energy
Measure the energy emitted to determine the presence and amounts of more than 60 elements.

12. DNA fingerprinting
DNA from root or other cells stuck to follicle

13. What is hair?
And who has it?

14. Who has hair?

15. Why do we have hair?
?????????

16. Why do mammals have hair?
1. Warmth 2. Decrease friction 3. Protect against sunlight 4. Act as a sense organ

17. Skin and Hair Structure

18. Skin and Hair Structure

19. Skin and hair Structure

20. Hair Structure

21. Hair Structure
Compare hair to a pencil.

22. Three Parts of Hair Composed of:
Cuticle— overlapping scales; protects cortex
Cortex— made of keratin (protein which makes hair strong and elastic) and imbedded with pigment; changes with perms, dyes, etc.
Medulla—innermost layer; purpose unknown

23. Cuticle Patterns 23

24. Cuticle Patterns scales appear like stacked cups (ex. Mouse)
Coronal (crown like)-
scales appear like stacked cups (ex. Mouse) 24

25. Cuticle Patterns Spinous (petal -like)
triangular shaped scales, often protrude from the shaft (ex. cat)

26. Cuticle Patterns
Imbricate-
Flattened, overlapping scales
(e.g.human)

27. Hair Scales point to end of hair.
The end of the hair is the oldest end.
Why is this important?

28. Medulla Pattern
Description
Diagram
Continuous
One unbroken line of color
Interrupted
(Intermittent)
Pigmented line broken at regular intervals
Fragmented or
Segmented
Pigmented line unevenly spaced
Solid
Pigmented area filling both the medulla and the cortex
None
No separate pigmentation in the medulla