Hair and Fiber Evidence

The region of a hair located just outside of the medulla containing granules of pigment is called:

cortex

Hair with no follicle is considered this type of evidence

class

A few fibers was picked up from a cloth couch onto a suspect's jacket. Some of those same fibers transferred from the suspect's jacket onto the victim during a fight.What type of transfer occurred?

secondary

All mammals have hair. One of its main purposes is to:

regulate body temperature

Is medulla pattern a macroscopic or microscopic feature of hair?

microscopic

Is hair length a macroscopic or microscopic feature of hair?

macroscopic

Can a person's exact age be determined using a hair sample?

No

Can general racial background be determined by analyzing a hair sample microscopically?

yes

Neuron Activation Analysis is a test that is used to determine what about hair?

drug or toxin presence

What does the follicle of a hair contain?

DNA

What is the most obvious microscopic difference in animal and human hair?

animal hair has a wider medulla

What is the difference in the cuticle of the hairs of animals and those of humans?

the cuticle scales have a different pattern

Does hair evidence alone prove guilt?

No

which medulla pattern is formed by one solid line that runs down the length of the hair shaft?

continuous

Which medulla pattern is formed from a series of small pieces of medulla that are all about the same size and evenly spaced apart?

interrupted

Which medulla pattern is formed from a series of inconsistently sized and spaced pieces of medulla?

fragmented

Is silk a natural fiber?

Yes

Is cashmere a natural fiber?

Yes

Is nylon a natural fiber?

No

Is fiberglass considered a natural fiber?

Yes

What is used to gather hair or fiber evidence?

forceps, tape, vacuum

Which type of fiber is generally cheaper, natural or synthetic?

synthetic

Which type of fiber is usually more absorbent, natural or synthetic?

natural

Which type of fiber is more environmentally friendly, natural or synthetic?

natural

Which type of evidence are fibers, class or inidividual?

Class

the smallest unit of a textile

fiber

material made from interlacing threads

textile

man-made fibers are called

synthetic

fibers that come from plants, animals, and minerals are

natural

When viewing two hair samples, you notice that one has a very wide medulla that takes up more than half of the width of the hair shaft. Is this hair animal or human?

animal