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Evidence and Investigation-grade 6

grade 6 science
by

Brooke Y

on 27 November 2013

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Transcript of Evidence and Investigation-grade 6

Evidence and Investigation
What is Evidence?
Evidence is an indication;
a sign; the facts available
for proving or supporting a
notion. Forensic evidence tends
to support facts admissible in
a court of law. Physical material
and witness testimony that can
be collected, analyzed and used to
solve a crime.
Fingerprints
No two people, not
even identical twins,
have the same pattern
of ridges on thier fingers. Whats more, each finger on a hand leaves a different print. A fingerprint you find at a scene can only belong to one person. If you identify the owner of the print, you know they must have been there.
Arch
Loop
Whorl
Composite
Before you were born,
papillae- tiny flesh
bulges- pushed up
through your skin to
form a pattern of ridges
on your hands and feet.
Your ridges enlarge as
your body grows, but
the pattern never changes.
Ridges may even endure
after death. Even after
a hand decomposed for days,
the outer skin can be
slipped off like a glove
with its ridges intact.
Type of
fingerprints
Footprints
Footprints are the
impressions or images
left behind by a walking
person. Hoofprints and pawprints are those left by animals with hooves or paws rather then feet, while "shoeprints" is the specific term for prints made by shoes.
They may either be
indentations in the
ground or something
placed onto the surface
that was stuck to the
bottom of the foot. A "trackway"
is of footprints in soft earth left
by a life-form; animal tracks are the
footprints, hoofprints, or pawprints
of an animal. with a footprint you can
also tell how tall, how much you wieght,
and what foot size you are.
D.N.A
Bullets
Every bullet has unique grooves on it from a specific gunthat it was fierd from (unique like a fingerprint to the gun)
Bullet=match to a gun= match to an owner.
Weapons can be analyzed for traces of other evidence. Investigators/forensic scientists can analyze a victim/body and tell what weapon was used(i.e. a knife and the size)
D.N.A. is ultimated evidence
unique chemical and genetic blueprint
for all living organisms

ex. blood, hair, fibre, skin, and salava
Fibre and Hair
Hair can lead to D.N.A.
evidence matching or as simple
as what a suspected person may
have been wearing.
Fibres can have traces of other
evidence such as drit/soil from a
specific place.Carpet fibres can show
if the victim,/body was moved from
another location. Matchto fibres from
victim's clothing to a suspect (i.e. matching
fibres from the trunk of a car)
Hair=hair color match to a suspect if not
victim's color AND hair=D.N.A.
Blood and Blood Patterns
Blood tells what weapon may have
been used. The direction of a blow
and blood type of the victim. Other blood
present could be a suspect's (D.N.A. match)
Witnesses and Victims as Evidence
by= Brooke date= 25/01/11
Witnesses and victims can tell
information about who may have been
around at the time of a crime. A body
has many cules on it (i.e. may have an attacker's
D.N.A. like skin cells under fingernails)
Futuristic Evidence
Improvements to D.N.A. profilling
and bases (huge computure matching
programs. Special lights to detect even
the most microscopic traces of evidence.
Rentinal scans to catalogue criminals.
Computure implant chips into convicted criminals
to be able to trace their whereabouts when
released from jail.
Full transcript