Unit 5: Hair

1. Unit 5: Hair

2. Objective: SWBAT identify forensic evidence found in hair samples. Do Now: What forensic evidence can be determined from hair?

3. Objective: SWBAT identify forensic evidence found in hair samples. Hair is the most frequently found piece of trace evidence. What is trace evidence?

4. Objective: SWBAT identify forensic evidence found in hair samples. • Usually Class evidence unless: • DNA in root is found = individual • Sometimes mtDNA testing can be done (still class evidence but more narrowed)

5. Objective: SWBAT identify forensic evidence found in hair samples. From hair one can determine: Human vs animal? Race (sometimes) Location of hair on body (head, leg...) Was hair was forcibly removed ? Was hair treated with chemicals? Were drugs/ toxins ingested? Individualized if root is present (DNA) Things hair can’t determine:• Age (except infant hair)• Gender (unless DNA in root)

6. Objective: SWBAT identify forensic evidence found in hair samples. Complete Strands of evidence reading on hair with questions

7. Questions on “Strands ofHair” Article • What is the basic technique of hair analysis? • Is visible hair analysis as reliable as fingerprints? • Generally, how else can hair be analyzed? • How do substances in the blood get into the hair? • What other techniques are used for hair analysis? • Drug use can be detected up to a _________________________. • What must be present for DNA analysis? • What other type of DNA can be located? Give 2 examples. • How does the Department of Defense use this testing? • What are the drawbacks to mDNA testing?

8. Objective: SWBAT identify forensic evidence found in hair samples. Do Now: Is Hair analysis as reliable as fingerprints?

9. Medulla Cortex Objective: SWBAT identify forensic evidence found in hair samples. Hair is composed of three principal parts (sketch in your notes): Cuticle

10. Objective: SWBAT identify forensic evidence found in hair samples.

11. Objective: SWBAT identify forensic evidence found in hair samples. The cuticle is the outside covering made of overlapping scales. Scales point down towards tip (older part) of hair.

12. Objective: SWBAT identify forensic evidence found in hair samples. 3 Basic Patterns of Cuticle

13. Non-HumanCuticle Structure

14. Objective: SWBAT identify forensic evidence found in hair samples. Cuticle Structure: Coronal Scales stacked like paper cups Ex. Bat Hair

15. Objective: SWBAT identify forensic evidence found in hair samples. Cuticle Structure: Spinous Scales shaped like petals Ex. Rabbit Hair

16. HumanCuticle Structure

17. Cuticle Structure: Imbricate Objective: SWBAT identify forensic evidence found in hair samples. Scales flattened and close together

18. Using the Microscope

19. Objective: SWBAT identify forensic evidence found in hair samples. Complete Activity: observing the cuticle

20. Objective: SWBAT identify forensic evidence found in hair samples. Do Now: What type of cuticle is present in human hair?

21. Objective: SWBAT identify forensic evidence found in hair samples. Complete Wayne Williams Case study

22. Objective: SWBAT identify forensic evidence found in hair samples. Do Now: What is the most common piece of evidence found at a crime scene?

23. Objective: SWBAT identify forensic evidence found in hair samples. Medulla • 3 types in Humans: • Continuous • Interrupted • Fragmented/Absent

24. Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Continuous Formed as a solid center line

25. Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Interrupted Medulla is seen as individual cells or fragments in repeating intervals

26. Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Fragmented/ Absent Fragmented: few parts visible Absent: no medulla visible

27. Animal Vs. Human

28. Objective: SWBAT identify forensic evidence found in hair samples. • The medullary Index is the ratio of diameter of medulla to the overall diameter of the hair • Medullary index: • Humans < 1/3 • Animal > 1/2

29. Objective: SWBAT identify forensic evidence found in hair samples. Complete activities: observing the medulla Closure: what is the medullary index?

30. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Do Now: How fast does your hair grow? Approximately how many inches a month?

31. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Naturally Shed Hair

32. Objective: SWBAT identify forensic evidence found in hair samples. Forcible Removal of Hair

33. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Burned Hair

34. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Toxicology

35. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. 1cm 2cm 3cm 4cm Grows approximately 0.5 inches (1.3cm) per month

36. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Closure:

37. Complete case study on central park jogger

38. Complete hair assessment lab