Crime Scene Studies Development Lab Level1

To discover what is the forensic science , Let us first find out some definantions …

CRIME SCENE: Any physical location in which a crime has occurred or is suspected of having occurred

  • PRIMARY CRIME SCENE: The original location of a crime or accident.
  • SECONDARY CRIME SCENE: An alternate location where additional evidence may be found.
  • SUSPECT: Person thought to be capable of committing a crime.
  • ACCOMPLICE: Person associated with someone suspected of committing a crime.
  • ALIBI: Statement of where a suspect was at the time of a crime.

Types of Evidence

  • Testimonial evidence includes oral or written statements given to police as well as court testimony by people who witnessed an event.
  • Physical evidence refers to any material items that would be present at the crime scene, on the victims, or found in a suspect’s possession.
  • Trace evidence refers to physical evidence that is found in small but measurable amounts, such as strands of hair, fibers, or skin cells.
  • May prove that a crime has been committed
  •  Establish key elements of a crime
  •  Link a suspect with a crime scene or a victim
  •  Establish the identity of a victim or suspect
  •  Corroborate verbal witness testimony
  •  Exonerate the innocent.
  •  Give detectives leads to work with in the case

Step 1: Interview

The first step in investigating a crime scene is to interview the first officer at the scene or the victim to determine what allegedly happened, what crime took place, and how was the crime committed. This information may not be factual information but it will give the investigators a place to start.

Step 2: Examine
The second step in the investigation of a crime scene, which will help identify possible evidence, identify the point of entry and point of exit, and outline the general layout of the crime scene.

Step 3: Document
The third step in the protocol involves creating a pictorial record of the scene as well as a rough sketch to demonstrate the layout of the crime scene and to identify the exact position of the deceased victim or other evidence within the crime scene.

Step 4: Process
This is the last step in the protocol. The crime scene technician will process the crime scene for evidence, both physical and testimonial evidence. It is the crime scene technicians responsibility to identify, evaluate and collect physical evidence from the crime scene for further analysis by a crime laboratory.



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