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The Crime Scene

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Tabitha Barkley

on 15 May 2015

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Transcript of The Crime Scene

The Crime Scene
Quiz - Question 1
Types of Sketches
There are two types; rough sketch and final sketch
Rough Sketch - basic sketches made when you first get to the crime scene.
Final Sketch - In complete detail and drawn to scale.
Cross Contamination
- The process by which bacteria or other microorganisms are unintentionally transferred from one substance to another, especially with physical evidence.

-Physical evidence whose origin is known, such as blood or hair from a suspect, that can be compared to crime scene evidence.

Finished Sketch
- A precise rendering of the crime scene, usually drawn to scale.

Buccal Swab
- Swab of inner portion; cheek cells are usually collected to determine the DNA profile of an individual.
Physical Evidence
It is very important to exclude onlookers. Every individual who enters the scene has the potential to destroy or remove physical evidence.
Recording a Crime Scene
Photography - Unsurpassed in the definition of detail it provides
Sketches - Record precise distances between important points in the crime scene.
Notes - Provides a source of detailed information about the scene for future reference.
The scene has to be completely unaltered in order for photos to be taken.
By: Tabitha, Chris, and Ryan W.
Physical evidence is any and all objects that establish that a crime has been committed or can link a crime and its victims or perpetrator. Examples. Broken glass, imprints, blood.
Processing a Crime scene
The first step in processing a crime scene is to secure and isolate the scene.
Rough Sketch -
A draft representation of all essential information and measurements at a crime scene. This sketch is drawn at the crime scene.

Chain Of Custody
- A list of all persons who came into possession of an item of evidence.

- Crime scene search pattern.

Physical Evidence
- Any object that can establish that a crime has been committed or can provide a link between a crime and its victim or between a crime and its perpetrator.

All crime scenes, including physical evidence, should be
, including points of entry and exit, and must also be taken from various angles.
Notes taken at the scene must include a detailed written description of the scene with the location of items of physical evidence recovered, the time discovered, by whom, and disposition of the item.
Evidence That Must Be
Collected at the Scene
Victim's Clothing
Fingernail Scrapings
Head and Pubic Hairs
Vaginal, Anal, and Oral Swabs
Recovered Bullets
Hand Swabs From Shooting Victims
All of these must be collected because its hard to get after the victim is buried.
Keeping Integrity
The integrity of physical evidence is best maintained when the item is kept in its original condition as found at the crime scene.
Rules For Trace Evidence
Trace evidence should not normally be removed from articles at a crime scene. Instead the entire object should be sent to the lab for processing.
There are two exceptions however:
If evidence is adhering to an object in a precarious manner, it should be removed and packaged.
If evidence is found adhering to a large structure, it should be removed with forceps or other tools.
Druggist's Fold
Steps to Make:
Fold in Thirds
Fold in Half

Druggist fold is a better method to store evidence in opposed to ordinary envelopes because powders of fine particles will leak out of the corners of an envelope.
How to Store Evidence
All items should be placed in separate containers to prevent damage through cross contamination.
Some evidence should be placed in an airtight container. An example is charred debris. This is to prevent evaporation of volatile residues.
Items like clothing should be placed in individuality separate bags and air dried.
Chain of Custody
What is needed when a crime scene is at a protected area such as a house or private part of a business?

a) A VIP pass
b) A search warrant
c) A police badge
d) Forensics ID

Chain of custody is a list of all people who came into possession of an item of evidence.
Failure to substantiate the evidence's chain of custody may lead to serious questions regarding authenticity and integrity of the evidence.
Substrate Control
A substrate control is a uncontaminated surface material close to an area where physical evidence has been deposited.
The sample is used to ensure that the surface on which a sample has been deposited does not interfere with laboratory tests.
Quiz - Question 2
What is the best thing to use to collect drug evidence?

a) Paper Bag
b) Regular Envelope
c) Druggist's Fold
d) Zip Block Bag
Quiz - Question 3
What is a chain of custody?

a) A list of everyone who has been in contact with the evidence
b) List of possible suspects
c) Line of prisoners
d) Box of evidence
Quiz - Question 4
Which is NOT an example of physical evidence?

a) Glass
b) Imprints
c) Blood
d) All of the above are physical evidence
Quiz - Question 5
What is the most important prerequisite for video recording a crime scene?

a) The body is moved
b) The scene is unaltered
c) Police are present
d) People are there to watch
Quiz - Question 6
What must be collected from a murder scene and sent to a forensic laboratory?

a) Clothing
b) Fingernail Scrapings
c) Head and Pubic Hairs
d) All of the above
Quiz - Question 7
Which is a method for recording a crime scene?

a) Photography
b) Sketches
c) Notes
d) All of the above
Quiz - Question 8
Which of the following should be stored in an airtight container?

a) Charred Debris
b) Drugs
c) Clothing
d) Shoes
Quiz - Question 9
What is the first step in processing a crime scene?

a) Remove the body
b) Look for evidence
c) Secure and Isolate the scene
d) Take Pictures
Quiz - Question 10
What is the best way to maintain the integrity of physical evidence?

a) Keep evidence in its original condition
b) Move the evidence
c) Throw away unimportant evidence
d) Refrigerate all evidence
Question 1 - Answer
b. A Search Warrant
c) Druggist's Fold
Question 2 - Answer
a) A list of everyone who has been in contact with the evidence
Question 3 - Answer
d) All of the above are physical evidence
Question 4 - Answer
b) The scene is unaltered
Question 5 - Answer
d) All of the above
Question 6 - Answer
d) All of the above
Question 7 - Answer
Question 8 - Answer
a) Charred Debris
c) Secure and Isolate the scene
Question 9 - Answer
Question 10 - Answers
a) Keep evidence in its original condition
Full transcript