Forensics chap 4

A thread is the smallest unit of a textile material that has a length of at least 100 times greater than its diameter

False

Light microscopic comparisons of fibers alone are not a reliable or valid form of evidence

True

Natural fibers come from animals, plants, or minerals

True

When working with yarns, twist direction is rarely analyzed as an identifying factor

False

Objects from which fibers are removed must also be logged and sent to the crime lab for analysis

True

Forensic scientist analyze fiber is almost exclusively with an ordinary light microscope

False

common fibers, such as cotton fibers are less soluble as evidence and uncommon fibers such as angora fibers

True

While MSP is helpful and analyzing very small samples, it is highly destructive process

False

Partially burn fibers are often still identifiable

True

Not all fibers must be spun into yarns or threads before being woven into textiles

True

within 24 hours and estimated percent _____ of all fibers have been lost in a crime scene

95%

_____ transfer occurs when fibers are transferred from a person or object to another person

Direct

Are derived from cellulose that are mostly plant in origin

Regenerated fibers

Is the number of threads per square inch and may help identify a textile in investigation

Thread count

_______ recording a fiver evidence may cause evidence to be inadmissible in court

Incomplete

A ________ is a type of microscope that can analyze the characteristic glow of different fibers

Ultraviolent light microscope

GCMS a type of chemical analysis perform performed on fiber stands for _______\\

gas chromatography mass spectrometry

The expected patternof contact among suspect, victim and crime scene will be determined by the

Type of crime committed

The non-destructive test that uses selective absorption of wavelength of light is

Fourier transform infared analysis 

clothing fibers transferred from a person to another person is called ____ transfer

direct

________ of all fibers may have fallen from a victim or been lost from a crime scene within 24 hours

an estimated 95%

Natural fibers are composed of _______, or long, repeating smaller molecules called monomers

polymers

____ is a very thin yarn

thread

When collecting fibers in the field or in the laboratory,

remove fibers individually

a _____ microscope (with a special filter) allows the scientist to look at the fiber using specific light wavelengths

polarizing

when evaluating the value of fiber evidenece, __________________________

a cashmere fiber has more value than denim fiber

fourier transform infared analysis of fiber

identifies molecular groups found within the fiber

analyzing a nylon blouse with a __________ requires damaging the fiber.

mass spectrometer

The GC-MS method of fiber analysis ________________

has replaced the destructive burn test analysis

A pink fiber from a wool sweater is collected from a crime scene for analysis. The pink wool sweater should be ______________

rolled inside paper and sealed in an evidence bag

Synthetic polymer fibers are _________________

manufactured to be woven onto textiles, ropes, and the like

Linen is a fabric produced from ______________

the thick region of plant stems

when testifying about fiber evidence in court, ______________

light microscopic comparisons of fibers alone are not reliable or valid evidence

fiber can be evidence when__________

it is transferred from an object to a person who transfers it to a second person