Ch. 12 Hair and Fibers

The​ (a)   is important for the individualization of hair.​

• follicular tag
• cuticle
• cortex
• medulla

The final growth phase in which hair naturally out of the skin is called the

• telogen phase

• anagen phase

• catagen phase

• follicular phase

The most prevalent plant fiber is

• hemp

• cotton

• wool

• mohair

Which of the following is not a manufactured fiber grouping?

• plyester

• rayon

• mohair

• spandex

In the examination of fibers, the first and most important step in the examination will be

• a microscopic comparison for color and diameter using a comparison microscope

• a determination of whether the fiber is natural or manufactured

• synthesizing long-chained molecules into a polymer

• analyzing the individual characteristics of the material

Because of advances in forensic technology and the equipment available, it is now possible to individualize human hair through its morphology.

• True

• False

Two of the features that make hair a good subject for establishing individual identity are its resistance to chemical decomposition and its ability to retain structural features over a long period of time.

• True

• False

Most often, when a hair evidence is present in a criminal case. the primary purpose is to establish the identity of the individual when no other means is available.

• False

• True

The ultimate value of fibers as forensic evidence will depend on the criminalist's ability to narrow their origin to a limited number of sources or event to a single source.

• True

• False

Properties frequently used to identify fibers are refractive index and an IR spectrum.

• True

• False

Tags

NGSS.HS-PS4-3