Microscopic
Who is known for the principle "every contact leaves a trace?"
Edmond Locard
Which protein makes up our hair? Where else is it found in humans?
Keratin
Fingernails and toenails
Fibers from plants and animals are called _________ fibers, but they can also be ______________ or man-made.
Natural
Synthetic
Do all hairs used as evidence have a follicle or root present?
No
A fiber is the smallest unit of a __________ material that has a length many times greater than its ___________.
Texture
Diameter
Microscopic Evidence is also called _____________ evidence?
Trace
True or False" Humans continue to grow hair follicles up through their teenage years?
False
_________ fibers are the most commonly used plant fibers in textile materials.
Cotton
Which part of the structure of hair is the outer coating composed of overlapping scales?
The cuticle
Which part of the structure of hair is protein-rich around the center that contains pigment?
Cortex
What is the process used to separate an explosive into the difference chemical compounds that make it up?
Chromatography
What clues about an individual could we learn from the examination of hair?
genetic background, hair color, diet nutrition, drug usage/medications, intentional alterations
______ is the animal fiber most frequently used in the production of textile materials and the most common wool fibers originate from sheep.
Wool
Which part of the structure of hair is considered the central core?
Medulla
What type of microscope can magnify objects up to 300,000x?
Scanning electron microscope
What is a comparison microscope and how is it used?
Two compound microscopes connected to an optical bridge that allows scientists to compare or view two things side by side.
What must be present in a hair sample to test for DNA?
Follicle (The root)
List two two examples of synthetic fibers.
Polyester
Acrylic
List two examples of synthetic fibers.
Rayon
Nylon
How do polarizing, fluorescent, and phase contrast microscopes help scientists see details that might be hard to see in normal lighting conditions?
They have different lenses and light sources to make details that are “invisible” under normal light appear for analysis
Give 7 examples of trace evidence?
Hairs & fiber, paint, explosives, dust & dirt, glass, shoeprints, tire tracks, toolmarks, bite marks, firearms, biological material, etc.
The structure of hair has been compared to a pencil with the medulla being the ________, the cortex being the ________, and the cuticle being the _________ on the outside?
Lead
Wood
Paint
___________ ___________ or multiple fiber transfers between a suspect's clothing and a victim's clothing dramatically increases the likelihood that the two individuals had physical contact.
Cross transfers
How do scientists collect trace evidence? Name one way
How do scientists collect trace evidence? Name on way.
One of three