FRS

What percentage of fiber evidence is typically lost from a crime scene within 24 hours?

85%

Which of the following is NOT a source of animal fibers?

Cellulose

What type of microscopy allows scientists to examine optical properties using specific wavelengths of light?

Polarizing light microscopy

Which fiber type is known for being extremely elastic?

Spandex

What is the term for threads that run lengthwise in woven textiles?

Warp

Which type of transfer occurs when fibers are picked up from the environment and then transferred to another person?

Secondary transfer

What material is silk derived from?

Silkworm cocoons

Which synthetic fiber is described as the most durable man-made fabric?

Nylon

What is the primary component of all plant fibers?

Cellulose

Which collection method is most appropriate for gathering fibers from large areas?

Vacuum

What characteristic do synthetic fibers have under magnification?

Regular diameters

Which fiber type was first introduced as artificial silk for pantyhose?

Nylon

What is the most common regenerated fiber?

Rayon

When is fiber evidence most valuable in forensic investigation?

Within 24 hours

Which mineral fiber is known to cause cancer?

Asbestos

What type of evidence are textiles considered due to mass production?

Class evidence

Which destructive test compares melting points and ash formation?

Burning

What is the thread count range typically found in luxury sheets?

800-1200

What are the building blocks of synthetic polymers called?

Monomers

Which fiber type is commonly used in doormats and baskets?

Coir

According to Locard's principle, what is the fundamental concept of trace evidence?

Every contact leaves a trace

Which microscope type can magnify objects up to 300,000X?

Scanning electron microscope

What is the primary protein found in hair?

Keratin

Which part of the hair structure contains the pigment that determines hair color?

Cortex

For nuclear DNA testing of hair evidence, what must be present?

Root

What type of microscope is used to compare two pieces of evidence simultaneously?

Comparison microscope

Which characteristic of hair is MOST important in distinguishing between different individuals?

Medulla pattern

What process is used to separate mixtures into their different components?

Chromatography

After birth, humans:

Produce no new follicles

Which type of evidence would be most useful in determining a person's drug use history?

Hair samples

In fiber analysis, what are the two main categories of fibers?

Natural and synthetic

What characteristic is NOT typically examined in fiber evidence analysis?

DNA composition

Which type of evidence can provide information about a vehicle's make and model?

Paint chips

For gunshot residue testing, within what timeframe must samples be collected?

6 hours

Which trace evidence can reveal where a person lives, works, and if they have pets?

Dust and dirt

What is required for a physical match analysis?

Unique matching edges

In document examination, what creates unique characteristics?

Handwriting style

Which layer of hair is composed of overlapping scales?

Cuticle

What type of DNA can be tested from hair shaft without a root?

Mitochondrial DNA

Which fiber is most commonly used in textile materials?

Cotton

What is the primary reason hair is not considered the best type of physical evidence for establishing identity?

It cannot definitively prove two hairs came from the same source

Approximately how many hairs does the average human shed daily?

100

When collecting hair evidence, which container should NOT be used?

Plastic bags

What is the primary function of hair in mammals?

Temperature regulation

Which layer of the hair shaft contains pigment granules?

Cortex

How many hair follicles does a human typically have at birth?

2 million

Which racial group commonly exhibits a continuous medulla pattern?

Native Americans

What is the recommended number of head hairs to collect from a suspect?

100

During which stage of the hair growth cycle is the hair easily lost?

Telogen

What is the approximate growth rate of human hair per month?

1.3 cm

If a hair's medullary index is 0.6, the hair is most likely from:

An animal

Which microscope type can detect the presence of hair dye?

Fluorescence microscope

What protein is hair primarily composed of?

Keratin

How long does the anagen (growth) phase typically last?

1000 days

What percentage of hair follicles are located on the head at birth?

10%

Which hair color typically has the fewest number of hairs?

Red

What type of evidence is hair classified as?

Class evidence

What happens to hair approximately 2-3 weeks after cutting?

The tips become rounded

Which test can identify up to 14 different elements in a single strand of hair?

Neutron Activation Analysis

What characteristic of forcibly removed hair distinguishes it from naturally shed hair?

Damage to the root area

What is the primary ingredient of glass?

Silicon dioxide (SiO2)