Study-Guide.-Chap-3-and

advertisement

Study Guide

Chapter 3

1.

Identify the various parts of a hair.

2.

Describe variations in the structure of the medulla, cortex, and cuticle.

3.

Distinguish between human and nonhuman animal hair.

4.

Determine if two examples of hair are likely to be from the same person.

5.

Explain how hair can be used in a forensic investigation.

6.

Calculate the medullary index for a hair.

7.

Describe the various functions of hair.

8.

Label a diagram of human skin. Indicate the following structures: a.

Hair b.

Hair follicle c.

Epidermis d.

Dermis e.

Capillaries

9.

Describe the role of Keratin in hair

10.

Describe what part of the hair is living tissue.

11.

Describe the three different growth phases of hair. Include in your answer: a.

Anagen b.

Catagen c.

Telogen

12.

Describe the difference in appearance between naturally colored hair and dyed hair.

13.

Explain why hair is considered to be class evidence.

14.

List different types of drugs that may be found in hair.

15.

Support the argument that hair is better evidence for long term drug use than a urine or blood sample taken from a dead body

16.

Given evidence hair collected from a crime scene and hair collected from several suspects, be able to determine if the evidence hair matches any of the suspects.

17.

Explain why at least 50 hairs need to be taken from both a rape victim and a rape suspect when trying to match a hair left at the crime scene with a specific person.

18.

Explain why a hair with the root still attached provides better evidence for identification of a suspect than just a single hair fiber.

19.

Provide two examples of how technology has improved a lab technician’s job of trying to match crime scene hair to that of a suspect. Include in your answer: a.

Comparison microscope b.

Neutron Activation Analysis

Chapter 4

1.

Identify and describe common weave patterns of textile samples.

2.

Compare and contrast various types of fibers through physical and chemical analysis.

3.

Describe principal characteristics of common fibers used in their identification.

4.

Discuss the role of fibers as a source of evidence in forensic investigations

5.

Explain if fiber evidence is consisted to be class or individual evidence.

6.

Explain the significance of why a forensic examiner would ask the following questions from the evidence collector when examining a fiber from a crime scene: a.

Where was the fiber found b.

What was the source of textile that contained the fiber? c.

What type of crime was committed? d.

What was the time between crime and discovery of the fiber

7.

Describe several different methods used to locate and collect fiber evidence from a crime scene.

8.

Discuss how the use of technology has improved fiber examination using the following two methods: a.

Polarizing light microscopy b.

Infrared microscopy

9.

Describe some methods of examining fibers that result in destroying the fibers. Include in your answer: a.

Burn test

10.

Distinguish between the terms: thread, yarn and textile

11.

Distinguish between the two types of fibers: natural and man-made (synthetic)

12.

List sources of natural fibers, including animal hair, plant fibers, silk.

13.

List several types of animal hair used in textile production

14.

Contrast the chemical composition of animal fibers to plant fibers.

15.

Provide examples of materials produced from the different parts of the plants listed below: a.

Seed Fibers b.

Fruit Fibers c.

Stem Fiber d.

Leaf fibers

16.

List examples of man-made or synthetic fibers.

17.

Explain why rayon is considered to be a regenerated fiber.

18.

Explain what polyester, nylon, acrylic and olefin all have in common.

19.

Explain how fibers are formed into yarns or rope.

Download