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Crime Scene Investigation

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Right Reason Technologies

on 13 May 2010

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Transcript of Crime Scene Investigation

Crime Scene Investigation Defining a Crime Scene Information obtained from a Crime Scene From DNA, droplets of blood, fingerprints and the like; the crime scene is full of valuable and vital information. Crime scene investigation is a methodical process that follows a strict set of rules. In this lesson you will learn How the crime scene is defined
What information is obtained from the crime scene When it comes to defning the Crime Scene we have to ask... Where is the crime scene? The following are things to look for once we've located the crime scene: Where is the location of criminal activity?
Is it scattered throughout the crime scene or in one small area?
What is the size of the area?
What Tyoe of crime was committed?
Where is the physical location of the crime? Let's look at how to go about defining a crime scene The only thing consistent about
a crime scene is inconsistency. There are many different ways to define a crime scene. It can be defined by its:
location
size
type of crime


LOCATION To define a crime scene by location means that we can define it by Primary Location or Secondary Location:
The site where the main crime happened is called the primary crime scene.
Any subsequent crime scenes are called secondary crime scenes.
While considering if it is the Primary or Secondary Crime scene, it is also important to consider the physical Location of the crime:
Indoors
Outdoors
Vehicle etc. A Primary Crime Scene This is an example of a primary crime scene.
The murder occurred in this location, which was
the first or original crime. This is labled the
primary crime scene because this is where the
crime actually took place. A Secondary Crime Scene is in some way related to the
crime but is not where the crime took place Fingerprints, DNA, physical evidence, blood droplets, victim property etc. are all examples of what may be found at a secondary crime scene. Primary crime scenes usually yield
more usable evidence than secondary crime scenes The next aspect of defining a crime scene is size.
The Macroscopic Crime Scene Presented to you by: Now lets look at how we can define the crime scene by SIZE.

The Size can be:
Macroscopic or
Microscopic

The macroscopic crime scene consists of a single location.
It is composed of many microscopic crime scenes.
Macro means large scale, so the entire location of a crime scene
is a macroscopic crime scene.
Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene A Microscopic Crime Scene
-focuses on a specific type of evidence
Some specific types of evidence are:
DNA (DNA Forensics)
Fluids such as blood, semen, urine, saliva, etc.(Serology)
Bones (Forensic Anthropology)
Extraneous materials such as poisions or drugs (Forensic Toxicology)
Teeth (Forensic Odontology)
Weapons or weapon remains (bullets) (Ballistics)
Insects (Forensic Entomology)

The final way to define a crime scene
is by the type of crime. There are many different types of crime that can be committed. Some are more serious than others.
Some of which are:
Homicide(murder)
Robbery
Suicide
Sexual Assault etc. Now that we've defined the Crime Scene we will explore the different information that can be obtained from a crime scene. The information collected from the crime scene (evidence)
is what will be used to attempt to solve the crime.
The more connections that can be made between the items at the scene, the better the chance is to solve the crime.
What should we be looking for? What to look for:

Corpus Delicti- the body of the offense
It must be proven that a crime was committed.
The dead body should be produced in the murder trial
Modus Operandi (MO)- when investigating the crime
the investigators will look for behaviors that they have seen in similar crimes. Often a criminal repeats certain behaviors when committing crimes. This is called an MO.Basically the method of operation of how the crime was committed. Locard's Exchange Principle when two objects come into contact with one another, an exchange of matter takes place.
Physical evidence can link suspect, victim, and objects to one another.


Consider the following example: Location of the Crime What can we tell from this photo? What kind of crime? homocide
Location? indoors

What did we Find? This shoe print matches victims shoes
This doesn't help us. These people have a reason to be angry with the victim. (A Motive)
What can we do? See if any of the other prints we collected match any of these suspects This is another shoe print found at the scene
It matches the shoes of a suspect in the photo.
We checked with stores, there have been 1,000,000
pairs of these shoes sold this year.

Does this help us? It gives us a lead, but we need more.
This print found at the scene matches the suspect in the upper left hand corner.
The Finger Print Specialists confirmed that it's a match. But that woman works
with our victim in the location of the murder, so this print could of been created
regular interactions.
Luckily, We found a piece of skin
under the victims finger nails. It was not his own.
After careful investigation from the DNA specialists
We found that this DNA also matched a different suspect... It takes a lot of different specialists to help solve a crime.
going over the crime scene meticulously is the only way to assure that nothing is missed.


By connecting all of the pieces, we found that one of the shoe prints, the finger/hand print, and the hair follicle belonged to that of Ms. Debora Walters, the woman in the upper left hand corer of the suspect photo. When questioning her we found that her and the victim were having an affair.
Once we recieved this information, we obtained a DNA sample from her husband and found that the
DNA from under the victim's nails was a match. During questioning, we found a deep scratch that would explain the skin left behind. After careful questioning, the investigators found an inconsistency in his story. When it was brought to his attention he confessed. Crime Solved.
Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene Microscopic Crime Scene This is a hair follicle found on the victims shirt cuff.
It belongs to the suspect in the upper left hand corner. The Verdict Ms. Debora Walters Mr. Jacob Walters Information from the Scene Corpus Delicti

Modus Operendi

Linking people, objects and crime scene

Obtaining and proving witness/suspect statements

Identification of suspects

Identification of unknown substances

Proving invetigative leads
Full transcript