Quiz 5 Fsc100 With Solutions 100%
Complete
Microscopic examinations coupled with DNA analysis can link human hairs to the originating
individual. Can find the difference between human and animal hair. Human hair can
reveal race, portion of the body from where the hair came from, and the colour of the hair. Other
analysis can determine whether the hair was forcibly removed. Arm and leg hair don't have
enough characteristics for comparison. When gathering control samples for the lab 50 full length
hairs should be collected and 12 pubic hairs should be collected. ( identification and exclusion).
Use ALS to locate hair sketches and photography to indicate location, pics with and
without ABFO scale, microscope photography, all require full labelling.
Question sample in bindles
Control sample in bindles
Cross-transference of fibres can occur in virtually every crime scene.
There are two broad groups of fibres man-made and natural.
, Quiz 5 Fsc100 With Solutions 100%
Complete
Natural fibres are derived from animals, this includes wool, mohair/cashmere, and fur.
The most prevalent plant fibre is cotton. Fibre cannot be directly linked to an individual but all
fibres at a crime scene should be collected.
Man-made fibres include rayon and nylon- or synthetics. The best thing to do is match
torn edges of cloth together- this is how evidence becomes individual evidence instead of class
evidence. Alternate light should make fibres visible.
Fibres are important because of Locard principle.
Fibre collection- locate, photograph and sketch immediately, collect with forceps,
pickups, tweezers, recovery tape.
Inserting paper evidence in between fibres prevents cross-contamination.
Most of the time glass is too fragmented to provide identification. Glass fragment yields mostly
class characteristics - not individual. However, an adequate sample may provide the
possibility for the forensic scientist to individualize fragments to a common source.
, Quiz 5 Fsc100 With Solutions 100%
Complete
Glass characteristics- colour, thickness, density, refractive index( how glass bends light),
composition.
Glass collection same as trace evidence.
Radical fractures spread out like spokes from the centre of a wheel
Concentric fractures- encircle the hole or point of impact.
It is not possible to accurately determine the size or circumstance of the projectile because
the angle of impact can distort the size
Soil can be different colours and could provide a link between the suspect, vehicle, and the
scene. Collect control samples. Usually only the top-surface level of soil will be picked
up. EPA- certified sterile containers should be used to collect soil. Documentation must contain
exact location where samples and controls collected.
Complete
Microscopic examinations coupled with DNA analysis can link human hairs to the originating
individual. Can find the difference between human and animal hair. Human hair can
reveal race, portion of the body from where the hair came from, and the colour of the hair. Other
analysis can determine whether the hair was forcibly removed. Arm and leg hair don't have
enough characteristics for comparison. When gathering control samples for the lab 50 full length
hairs should be collected and 12 pubic hairs should be collected. ( identification and exclusion).
Use ALS to locate hair sketches and photography to indicate location, pics with and
without ABFO scale, microscope photography, all require full labelling.
Question sample in bindles
Control sample in bindles
Cross-transference of fibres can occur in virtually every crime scene.
There are two broad groups of fibres man-made and natural.
, Quiz 5 Fsc100 With Solutions 100%
Complete
Natural fibres are derived from animals, this includes wool, mohair/cashmere, and fur.
The most prevalent plant fibre is cotton. Fibre cannot be directly linked to an individual but all
fibres at a crime scene should be collected.
Man-made fibres include rayon and nylon- or synthetics. The best thing to do is match
torn edges of cloth together- this is how evidence becomes individual evidence instead of class
evidence. Alternate light should make fibres visible.
Fibres are important because of Locard principle.
Fibre collection- locate, photograph and sketch immediately, collect with forceps,
pickups, tweezers, recovery tape.
Inserting paper evidence in between fibres prevents cross-contamination.
Most of the time glass is too fragmented to provide identification. Glass fragment yields mostly
class characteristics - not individual. However, an adequate sample may provide the
possibility for the forensic scientist to individualize fragments to a common source.
, Quiz 5 Fsc100 With Solutions 100%
Complete
Glass characteristics- colour, thickness, density, refractive index( how glass bends light),
composition.
Glass collection same as trace evidence.
Radical fractures spread out like spokes from the centre of a wheel
Concentric fractures- encircle the hole or point of impact.
It is not possible to accurately determine the size or circumstance of the projectile because
the angle of impact can distort the size
Soil can be different colours and could provide a link between the suspect, vehicle, and the
scene. Collect control samples. Usually only the top-surface level of soil will be picked
up. EPA- certified sterile containers should be used to collect soil. Documentation must contain
exact location where samples and controls collected.
