81-121 mistakes legal studies yearly Flashcards
(38 cards)
Who are witnesses?
Witnesses are people who know something about the case and who give evidence in court about what they know.
Can police officers be witnesses?
The prosecution witnesses include the police officers who investigated the case and arrested the alleged offender.
Define crime scene
Any physical location in which a crime has occurred or is suspected of having occurred.
Define primary crime scene
The original location of a crime or accident
Define secondary crime scene
An alternate location where additional evidence may be found.
Define suspect
Person thought to be capable of committing a crime.
Define accomplice
Person associated with someone suspected of committing a crime
Define alibi
Statement of where a suspect was at the time of a crime.
Define testimonial evidence
Testimonial evidence includes oral or written statements given to police as well as court testimony by people who witnessed an event.
Define physical evidence
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.
Define trace evidence
Trace evidence refers to physical evidence that is found in small but measurable amounts, such as strands of hair, fibers, or skin cells.
Three types of evidence
Trace, physical and testimonial evidence
Role of police officers
POLICE OFFICERS are typically the first to arrive at a crime scene. They are responsible for securing the scene so no evidence is destroyed and detaining persons of interest in the crime.
What is the purpose of CSI UNIT documents?
The CSI UNIT documents the crime scene in detail and collects any physical evidence.
Role of detectives
DETECTIVES interview witnesses and consult with the CSI unit. They investigate the crime by following leads provided by witnesses and physical evidence.
Role of specialists
SPECIALISTS (forensic entomologists, anthropologists, or psychologists) may be called in if the evidence requires expert analysis
Role of medical examiner
To determine a preliminary cause of death.
What are the steps in investigating a crime scene?
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 the crime was committed. This information may not be factual information but it will give the investigators a place to start.
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.
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.
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.
Role of drug chemistry
Determines the presence of controlled substances and the identification of marijuana
Role of trace chemistry
Identification and comparison of materials from fires, explosions, paints, and glass
What is microscopy
Microscopic identification and comparison of evidence, such as hairs, fibers, woods, soils, building materials, insulation and other materials.
Role of biology/DNA in forensics
Analysis of body fluids and dried stains such as blood, semen, and saliva.
What is toxicology?
Tests body fluids and tissues to determine the presence of drugs and poisons.
What are Latent prints?
Identification and comparison of fingerprints or other hidden impressions from sources like feet, shoes, ears, lips or the tread on vehicle tires.