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Module 2 The Crime Scene
Terms in this set (35)
secondary crime scenes
Additional sites where criminal activity might have happened
questioned sample or unknown sample
a sample of physical evidence that is collected at a crime scene
the origin is unknown
a sample that comes from a particular person or place
the origin is known
protects individuals from unreasonable searches and seizures
Define physical evidence.
anything that can be established that a crime took place and anything that links the crime to the criminal
3 examples of physical evidence.
weapons, fibers, and hair
The first person/official to arrive at a crime scene is known as the ___________________ and they are responsible for making sure ___________________________________________.
Blank 1: first responder
Blank 2: everyone at the scene of the emergency is safe
When the scene is safe, the first responding officer's next duty is to ____________________________. Then, the first responding officer must _______________________________ about the crime scene as soon as possible.
Blank 1:secure the crime scene
Blank 2: document as much as they can
Before investigators remove objects from the crime scene, they ___________________ them. Any items that are moved before being ____________________ should be ______________________.
Blank 1: photograph
Blank 2: photographed
Blank 3: documented
show the crime scene in wide angles
taken from different vantage points to show entire and exits to and from the crime scene
closer to the evidence but still show the area surrounding it
show evidence in relation to other objects in the room
can show the position of the body in relation to the rest of the crime scene
may focus on an injury, a weapon, or a piece of evidence.
record specific details that may not be picked by photographs taken form longer ranges.
should include a card with an identification number
1 or 2 additional items should be included to provide scale
show the location of evidence, accurate distances between pieces of evidence, and the dimensions of the crime scene
contain measurements so later drawings can be drawn to scale
should contain information such as the case identifier, date, time, a key to identify the objects in the sketch, orientation of the scene, and other relevant information like weather or lighting
precise representation of the scene
created using aids like computer programs and drafting tools
drawn to scales, showing the precise distances between objects in the room and their relationships in space
What is the chain of custody?
- list of all person who had possession of the evidence during the crime investigation
- lets law enforcement track access to the evidence
- shows that the evidence was in the possession of law enforcement from the time of its discovery until its use in court
- helps prevent evidence contamination and tampering
What is impression evidence?
- evidence created when two objects come into contact with enough force to make an impression
- fingerprints, shoe prints, and tire tracks
- collected by using advanced photography techniques, molds, chemical developers, or by taking the whole area containing the impression back to the lab
Give 3 examples of impression evidence.
fingerprints, shoe prints, and tire tracks
Why are firearms and ammunition collected?
they are evidence
How are firearms and ammunition collected and stored?
- placed in a paper bag or envelope and tagged
- helps prevent moisture from building up
What is biological evidence?
- samples of biological material
- can be located by sight, smell, or touch
Give an example of biological evidence.
blood, hair, tissue, bones, teeth, semen, other bodily fluids
In most cases, how is a wet sample collected?
- will be allowed to dry before a scraping is taken
- will be put on a swab and then allowed to dry
What is trace evidence
- created when objects touch
- small evidence that is often had to find
- ex. fibers, hair, soil, gunshot residue
In the late 1960s, a man named Charles Manson coerced many young men and women to join his cult, referred to as "The Family." In 1969, Manson sent several members of "The Family" to murder five people in a north Beverly Hills home. The victims were shot, stabbed, and beaten to death, leaving a bloody and gruesome scene for investigators. Over time, the murders became known as the LaBianca-Tate Murders.
Imagine that you are one of the crime scene investigators for these murders. You have been told to collect blood samples from all the victims. When you arrive, you observe that the blood on the scene is still wet.
How do you properly collect these blood samples?
I would use a swab to collect the wet blood and let it dry before placing in a storage container.
Improper storage of blood and bodily fluids can ________________ impact the __________ and ultimately compromise the investigation and case.
Blank 1: negatively
Blank 2: DNA
After investigators document and collect evidence, they submit it to the crime lab for testing. Evidence can be __________________ or ___________________. There are restrictions on shipping certain types of ____________________ and ______________________________.
Blank 1: hand-delivered
Blank 2: shipped by mail
Blank 3: chemicals
Blank 4: explosive materials
The 4th Amendment protects: _________________________________________________.
individuals from unreasonable searches and seizures
What are the exceptions to the 4th Amendment?
- a search warrant is not required to seize illegal items in plain sight
- officers can enter a building if they believe that someone inside need emergency medical attention or to look for additional victims and perpetrators
- individuals can also waive their rights and voluntarily allow officers to search their vehicle or home
Why is it important to secure the crime scene? What do you think would be the most difficult part of doing this?
What type of recording do you think would be the most useful to crime investigators? Why?
What do you think would be the best method of submitting evidence to a crime lab? Why?
What type of evidence do you think would be most difficult to collect? Why?
What does the Fourth Amendment protect against? Do you agree with these restrictions on collecting evidence? Why or why not?
You are the first responding officer to a crime at an outdoor public basketball court. Walking onto the scene, you observe a person lying face down in the middle of the court. The person is not moving and appears to have been shot; there is a large pool of blood next to the body. Several people stand around the court, and you can't see an obvious murder weapon.
The job of a first responder includes many different responsibilities, but what is the first thing that you might do as a first responder walking onto the above scene?
As a first responder, the first thing you would do is to ensure that the scene is safe and that no one requires medical attention.
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