1.
Do Now:
What was Dr. Edmond Locard contribution to
forensic science?
2. Looking at this
picture, what
evidence could
be found on the
beer can? (locard
exchange principle)
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Notebook set up Wednesday
Notebook checks Thursday
Grades posted on Friday
Mshinton.cmswiki.wikispaces.net
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Procedures
Forensic Science
Locard Exchange Principle
Example
3
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Forensic Science is the application of science to
law.
4
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Whenever 2 objects come in contact
with one another, they exchange
some material
5
You and a partner come
up with steps on processing a crime scene.
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When the police arrive --- > when evidence is
collected
Ten step max
If you finish early…
Get three different colored sheets of
paper in front of you.
Find some scissors
Find some tape
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FOLDABLE
Clear your table
6 groups
7s crime scene
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The Scene is simply defined as the actual site or
location in which the incident took place.
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Important that the first responding officer on the scene protect the individuals
involved as a first priority.
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Protecting the evidence is the second task. The entire investigation could be
dependent on this.
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Scene is secured by a restricting a
perimeter, utilizing rope or tape.
Who
What
When
Where
Why
How
Why is it important to secure the scene?
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Why????
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Witnesses must not be allowed to talk with
each other.
This is done so they do not compare stories and
so that a new story is not created. (collusion)
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What witnesses say weighed heavily
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Testimonial Evidence
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Statement made under oath
What is said in court by a
competent witness
Also called direct evidence
Why would
testimonial
evidence be called
direct evidence???
Are they accurate?
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Certain information affects eye witness accounts
 Mug shots
 Leading/Suggestive questions
Memory errors
 Time between the crime and questioning of witness can affect what they
remember
 Perception errors
 Too dark
 Encounter too brief
 Presence of weapon diverted witnesses attention
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Certain information affects eye witness accounts
 Mug shots
 Leading/Suggestive questions
Memory errors
 Time between the crime and questioning of witness can affect what they
remember
 Perception errors
 Too dark
 Encounter too brief
 Presence of weapon diverted witnesses attention
 Perception Error
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National organization dedicated to exonerating
wrongfully convicted people through DNA
evidence
Eye witness misidentification is the number
one cause of wrongfully convictions
nationwide
As of 2008, the Innocence Project exonerated
212 wrongfully convicted people
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Do nows and objectives
Forensic science
LEP
7s in order
1s
2s
QUESTONS???
Remember this is done individually and silently
Complete sentences for each question
Because you are writing in complete sentences you do not
need to write the question
1. What could happen if the 7s was done out of order?
2. What may happen if the first officer on the scene forgot to secure
the scene?
3. Why is testimonial evidence unreliable?
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A forensic examiner needs to be able to scan the scene to
determine if there is a primary crime scene or potentially a
secondary crime scene.
Primary scene- place the incident occurred
Secondary scene- any other place connected to the incident
Ex.
This is done by the team leader who assumes control
and assigns other duties such as who will be the :
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Photographer
Log Recorder
Sketch Artist
Evidence Recorder and other personnel
Specialist- entomologist, blood splatter, etc
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Done by the photographer
A photograph is a two-dimensional reproduction of the crime scene.
It serves as the permanent record of the crime scene.
Everyone involved in the investigation will have an opportunity to look at theses
photographs (the District Attorney, the defense counsel,
homicide detectives, etc).
They are also very important to you because the photographs will serve as
“memory joggers” when you have to get up on the witness stand and testify.
Good pictures are essential because most trials do not take place until a year
or more has passed.
Videos can also be taking at the crime
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This is done by the photographer
Requirements of each photo:
Photograph overall area from up close and medium
range and far away prior to moving anything.
Close up of each piece of evidence with evidence
marker (including corpse)
Include a point of reference to indicate size. ( a ruler, a
pen, a car key)
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An accurate rough sketch drawn to scale noting
position of evidence and body.
All objects should be measured from 2
immovable landmarks
Sketch should include Case #, date, time,
locations, and assignments.
Also included should be dimensions of room,
furniture, doors, windows, distance of objects
or bodies from entrances and exits
Key Legend, should include direction and scale
Date: August 14, 2001
Time: 11:35
Criminalist: Ann Wilson
Location: 4358 Rockledge Dr
St. Louis, Mo.
A. Couch/sofa
E
c
B. Female body
D
C. Knife
D. Over turned Lamp
E. Chairs
E
F. Table
G. Fireplace
G
A
F
E
E
E
28
Remember this is done individually and silently
2-3 complete sentences for each question
Because you are writing in complete sentences you do not
need to write the question
1. What could happen if the 7s was done out of order?
2. What may happen if the first officer on the scene forgot to secure
the scene?
3. Why are photos and sketches an important part of crime scene?