FSER Day 4 Hair and Fiber Analysis

What is Loccard's Exchange Principle?

• Perpetrators always leave evidence behind.

• Every contact leaves a trace.

• All touches leave evidence.

• Long, violent confrontations leave evidence.

What does a damaged hair root tell investigators?

• The hair was forcefully removed.

• The suspect was attacked.

• There was a struggle.

• The hair fell out of the person's head.

What are the three layers of hair?

• Medulla, keratin, cortex

• Cuticle, medulla, keratin

• Keratin, cuticle, cortex

• Medulla, Cortex, and Cuticle

How do you calculate the medullary index?

• Width of the medulla

  Width of the hair

• Width of the hair

  Width of the medulla

• Width of the cortex

  Width of the medulla

• Width of the medulla

  Width of the cortex

Fiber does NOT fall into what type of evidence?

• Individual

• Class

• Trace

• Circumstantial

How can you tell the difference between animal and human?

• Human is imbricate and animal is always spinous.

• Human medullary index is much less.

• Human hair is thinner than animal hair

• Animal hair has a thicker cortex than human.

Tags

NGSS.MS-LS4-2

Which of the following hair types has an oval cross section?

• Caucasian

• African

• Asian

• None of the above

Which of the following hair types has densely distributed pigment granules?

• Caucasian

• African

• Asian

• None of the above

Which of the following hair types has prominent twisting and curling shafts

• Caucasian

• African

• Asian

• None of the above

The hair follicle is dormant (not growing hair anymore) and hairs are easily lost during which stage of the hair life cycle?

• Anagen

• Telogen

• Catagen

• Metagen