Do Now: What was Dr. Edmond Locard contribution to forensic science? 2. Looking at this
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Transcript of Do Now: What was Dr. Edmond Locard contribution to forensic science? 2. Looking at this
COMPLETE THE FOLLOWING ON A SHEET OF PAPER. WRITE THE OBJECTIVE AND ANSWER THE QUESTIONS IN COMPLETE SENTENCES. YOU DO NOT HAVE TO WRITE THE QUESTIONS.
THIS IS SILENT AND INDEPENDENT WORK.
Do Now:1. What was Dr. Edmond Locard contribution to
forensic science?
2. Looking at thispicture, what evidence couldbe found on thebeer can? (locard exchange principle)
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Review Procedures Forensic Science Locard Exchange Principle Example
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Forensic Science
Forensic Science is the application of science to law.
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Locard’s Exchange Principle Whenever 2 objects come in
contact with one another, they exchange some material
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Processing a crime scene You and a partner come up with steps on processing a crime scene.
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 scissorsFind some tape
Processing a crime scene FOLDABLE
Clear your table 6 groups 7s crime scene
The Seven S’s of a Crime Scene?
The Scene is simply defined as the actual site or location in which the incident took place.
Securing the Scene Important that the first responding officer on the scene protect the individuals
involved as a first priority. Protecting the evidence is the second task. The entire investigation could be
dependent on this.
Scene is secured by a restricting a perimeter, utilizing rope or tape.
WhoWhatWhenWhereWhyHow
Why is it important to secure the scene?
Separating the Witness Why????
Separating the Witness 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)
Separating the Witness What witnesses say weighed heavily
Testimonial Evidence Testimonial Evidence
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???
Testimonial evidence
Are they accurate?
Testimonial evidence 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
Testimonial evidence 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
The Innocence Project 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
7s again
Review Do nows and objectives Forensic science LEP 7s in order 1s 2s QUESTONS???
Exit Ticket
Remember this is done individually and silentlyComplete sentences for each questionBecause you are writing in complete sentences you do notneed 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?
Scanning the Scene 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 : Photographer Log Recorder Sketch Artist Evidence Recorder and other personnel Specialist- entomologist, blood splatter, etc
Seeing the scene 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
Seeing the Scene 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)
Sketching the Scene 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
Crime SceneSketch
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Date: August 14, 2001 Criminalist: Ann WilsonTime: 11:35 Location: 4358 Rockledge Dr
St. Louis, Mo.
A. Couch/sofa
B. Female body
C. Knife
D. Over turned Lamp
E. Chairs
F. Table
G. Fireplace
cD
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A G
F
Exit Ticket
Remember this is done individually and silently2-3 complete sentences for each questionBecause you are writing in complete sentences you do notneed 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?