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
eyewitness statement:
Refers to an account given by people of an event they have witnessed
testimonial evidence:
Includes oral or written statements given to police as well as court testimony by people who witnessed an event
trace evidence:
Fragments of physical evidence that can be transferred when two objects interact
physical evidence:
Refers to any material items that would be present at the crime scene, on the victims, or found in suspects possession
secure the scene -
done by first responding officer
seperate the witnesses -
ensure that no one present at the scene of the crime communicates with each other
scan the scene -
determine what to photograph
seeing the scene -
take photographs
sketch the scene -
a rough sketch of the scene before the final copy is created
search for evidence -
take a linear, spiral, grid, or quadrant route in order to locate evidence
secure the evidence -
ensure all collected evidence is properly packaged and sealed
who is part of the investigation team?
路聽聽聽聽聽聽 Police officers
路聽聽聽聽聽聽 Crime scene investigators
路聽聽聽聽聽聽 Medical examiners
路聽聽聽聽聽聽 Detectives
路聽聽聽聽聽聽 Forensics specialists
路聽聽聽聽聽聽 District attorney (if required)
eyewitness example
Eyewitnesses may be required to give description at a trial of a robbery or a road accident someone has seen. This includes identification of perpetrators, details of the crime scene, etc.
reality for eyewitnesses
In reality, the memory doesn鈥檛 record experiences (like a video camera); It creates stories based on true experiences
physical evidence examples?
paint, glass, explosives, ballistics, dust/dirt, tracks, fingerprints, tool marks, wounds, dna, skeletal remains, bodily fluids
what are the different types of evidence?
circumstantial (ie. trace), physical, biological, testimonial, class/individual
what is the chain of custody?
the movement + location of physical evidence from the time it is obtained until it is presented in court
what are the different priorities at a crime scene?
路聽聽聽聽聽聽 Obtain medical aid to those in need
路聽聽聽聽聽聽 Arrest the perpetrator
路聽聽聽聽聽聽 Secure the crime scene
路聽聽聽聽聽聽 Determine crime scene boundaries
路聽聽聽聽聽聽 Located path of entry and exit
what happens when lead investigators arrive at the scene?
1.聽聽聽聽 Boundaries of scene determined
2.聽聽聽聽 Establish perpetrators path of entry and exit
3.聽聽聽聽 Obvious items photographed and documents
4.聽聽聽聽 Initial walk through to gain overview and develop strategy for systematic search
what are fibres?
smallest unit of textile material woven or twisted together to form a thread or yarn
what are the types of fabric weaves?
plain, twill, and satin
what are types of synthetic fibres?
polyester, rayon, nylon, acetate, acrylic, spandex
what are types of natural fibres?
silk, cotton, wool, mohair, cashmere
what is the usage of hair particles?
It can give evidence of age, gender and race which can strengthen ties between a suspect and the crime scene
rigor mortis
the stiffening of the body muscles after death