Intro. to Forensics
These professionals work with witnesses to recreate semi-realistic drawings of perpetrators.
Forensic sketch artists
During this step of crime scene investigation, items are handled carefully and packaged separately to avoid cross contamination.
Securing and collecting evidence
The hair shaft is composed of the cuticle, cortex, and ___.
Medulla
What is the smallest indivisible unit of a textile?
Fiber
What is the main ingredient in glass?
Sand
The reason that it is important to separate witnesses at a crime scene is to___.
Prevent the witnesses from influencing each other.
What is the minimum number of photographs that an investigator will take of ONE piece of evidence at a crime scene?
9
The ratio of the diameter of the medulla to the diameter of the entire hair is known as the _______.
Medullary Index
What is the pattern in which the weft passes over and under the warp fibers?
Weave Pattern
Type of fracture that forms on the opposite side of the impact and looks like spiderwebs.
Radial Fracture
What percentage of the cases re-evaluated by the Innocence Project have been found to be wrongful convictions?
87%
During this step of crime scene investigation, the first officer arrives and puts up barrier tape or barricades to prevent unauthorized access to the scene.
Securing the Scene
What part of the hair must be present in order to conduct a full DNA analysis?
Follicle
What is a flexible, flat material made by interlacing yarns?
Textile
Type of fracture that occurs on the same side of the glass as the impact and encircles it.
A person who has seen someone, or something, related to a crime and can communicate their observations.
Eyewitness
To show directionality, what must all crime scene sketches have?
True North
What makes up the largest part of the hair and contains the pigment?
Cortex
What is a measure of the number of threads woven into one square inch of fabric?
Thread Count
What are two sheets of ordinary glass bonded together with a plastic film?
Laminated Glass
Who is known as the Father of Forensics?
Dr. Edmond Locard
According to the Chain of Custody, where should sealed evidence be opened?
At a location other than the sealed/signed edge.
How many classifications are there of the medulla?
Five
What type of transfer occurs if a carpet fiber adheres to a victim’s clothing and then is deposited on a suspect’s jacket?
Secondary Transfer
What are the two most important physical properties of glass for forensic comparison?
Density and Refractive Index