Hair and fibre evidence Flashcards

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1
Q

physical evidence

A

Evidence that is large and visible eg. blood, broken glass

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2
Q

trace evidence

A

evidence so small you cannot see it
with the naked eye

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3
Q

strong evidence that a suspect has been at a crime scene.

A

Strands of hair or fibres from clothes, furniture and carpets

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4
Q

A forensic scientist compares fibres found at a crime scene, or on a
victim, with those found on

A

suspects’ clothes, in their homes or in their
cars.

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5
Q

how do foresinci scientist find out if the fibres have been cut or torn

A

microscope

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6
Q

Fabrics are made from either

A

natural or man-made fibres
woven together.

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7
Q

Some fabrics are a combination of

A

different fibres.

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8
Q

what looks different under a microscope

A

each type
of fibre looks different.

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9
Q

what can foresnic scientists discover after looking at hair samples under microscopes

A

forensic
scientists can tell whether the sample belongs to a human or a
different animal.

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10
Q

cuticle

A

The scaly, outer covering that is different in each animal species

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10
Q

what does a micrscope tell foresinc scientists about hair

A

thickness, coarse, colour and structure of hair

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11
Q

What kind of hair provides DNA that can link hairs to a suspect

A

Hair that has been pulled out can have skin or other substances
stuck to it.

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12
Q

Explain how fibres can be important evidence in the solving of a crime.

A

Fibres are important because they can determine if the suspect was at the scene of the crime by matching the fibres.

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13
Q

difference between natural fibres and synthetic fibres.

A

Natural fibers are the fibers which are made by using natural source materials such as plants and animals. The synthetic fibers are the ones that are made from chemical synthesis.

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14
Q

Describe five different tests for comparing two fibres that may be carried out in the forensic
laboratory.

A

optical test
microscopic test
density test
burning test
solubtilty test

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15
Q

types of hair fibres

A

acrylic fibres
nylon fibres
merino wool fibres
cotton fibres

16
Q

structure of natural fibres

A

rougher surface, taper from root to tip and appear somewhat irregular.

17
Q

structure of wool fibres

A

like hair hae scales

18
Q

structure of synthetic fibres

A

smooth and even and have a much longer length (staple).

19
Q

how to know if fibres come from the same source

A

same thickness, strength, colour, and melting point

20
Q

Explain at least two ways in which a small piece of fabric found at a crime scene might be useful in solving a crime.

A

The print/pattern of the fabric can be compared to the suspects clothes.
If theres a whole or shape on the fabric, it identifies what garment the fabric is from.

21
Q

4 types of animal fibres

A

-fur,
wool,
silk
cashmere

22
Q

4 types of Plant fibres

A

cotton,
hemp,
flax
bamboo

23
Q

4 types of synthetic fibres

A

-spandex,
polyester,
nylon
acrylic fibres

23
Q

what indications does hair give

A

age, race and sex