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Lecture 3

FSCI 1010U Lecture Notes - Lecture 3: Start I, Actual Size, Hyperparameter Optimization


School
UOIT
Department
Forensic-Science
Course Code
FSCI 1010U
Professor
Nelson Lafreniere
Lecture
3

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Forensic Science Lecture 4 01.27.16
Crime Scene Investigation
Defining a Crime Scene
“Any place where a crime has been committed.”
Many different ways to classify a crime scene
1. Location of original criminal activity
2. Size of the crime scene
3. Other
The Importance of Physical Evidence (PE)
Physical Evidence can…
1
Three major avenues available to invesgators to solve crimes:
Confessions Eyewitness accounts Physical evidence
has nothing to do
Site of the original crime
Entry Point Weapon Body
Any subsequent locations
The overall crime scene
Trace evidence
Only physical
evidence is free of
inherent error or bias

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Forensic Science Lecture 4 01.27.16
***Out of Lecture Activity***
Physical evidence often lacks individual characteristics that can tie a suspect to a crime
The likelihood that the suspect and victim are related depends on the number of pieces of
evidence linking them and the uniqueness of the evidence
The product rule states: The probability of two independent ecents occurring together can be
calculated by multiplying the individual probabilities of each event occurring alone
2. y
Crime Scene Investigation
Principles of crime scene investigation are critical, helping:
Recognize, preserve, collect and interpret physical evidence.
How do you determine what is evidence?
.. You don’t! Treat everything as evidence.
Experience and skill helps; Teamwork is key.
General Crime Scene Procedures
2
Crime Scene
Reconstrucon
Link a
system with
a vicm or
with a crime
scene
Establish
identy of
persons
associated with
crime scene
Corroborate
or refute
tesmony
Be more
reliable
than
tesmony
Provide
invesgave
leads
Idenfy
unknown
substances
Prove a
crime was
commi$ed
Case 2
Red Hair (11%)
Type B Blood (12%)
Loop Fingerfrints
(65%)
Case 1
Blonde hair (32%)
Type O Blood (43%)
Arch Fingerprints (5%)
0.11x 0.12x
0.65
=
(0.00858)x 100
= .858
0.32x 0.43x
0.05
=
(0.00688)x100
= .688%
Case 3
Brown Hair (51%)
Type AB Blood (3%)
Whorl Fingerprints
(33%)
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Forensic Science Lecture 4 01.27.16
Crime scenes are busy places and proper management of a scene is critical
The lead investigator is often the most experienced individual and is responsible for
managing:
oInformation – What information will be released to the press?
oManpower – How many people do you need?
oLogistics
oTechnology
Several different management models available based on allocation of personnel,
resources, training, expertise, etc.
Maintaining good communication among all personnel is critical to a successful
resolution to the investigation
The First Responder
The first person at the scene of a crime
They are the only people to view a crime scene in its most original and pristine
condition.
Their actions at the scene can have far reaching consequences
They should always keep in mind they are the first step in linking a victim to a suspect
The first responder has several important duties
The Duties of a First Responder
1. Assist the victim and prevent any changes to the victim
2. Search for and arrest the suspect if they are still there
3. Detain any witnesses
oKeep them separated to maintain objectivity
oDon’t let them return to the crime scene
4. Protect and secure the crime scene
oEstablish a perimeter
Limits access to the scene
Prevents contamination
5. Document all movements, alterations, or changes made to the crime scene and pass the
information along
Crime Scene Survey
The preliminary scene survey is the first examination or orientation of the crime scene
by the crime scene investigator
The following guidelines should be followed:
oUse the walk-through as a mental beginning for a reconstruction theory – be
prepared to change your mind
oNote any evidence that needs immediate protection or processing
oBe aware of impending weather conditions that could affect a scene
oNote possible points of entry or exit
oBriefly record initial thoughts on who, what, where, when and how
3
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