Shoe Prints & Impressions
What should be placed beside a shoeprint when photographing it?
A measurement scale/ruler
Name two ways tire track evidence can be recovered.
Photography and casting
What part of a cartridge is struck by the firing pin?
Primer
What are firing pin markings?
Impressions left on the primer by the firing pin
What is the largest planet in our solar system?
Jupiter
How are plastic impressions preserved?
By making a cast, usually with dental stone or plaster
Are tire marks class or individual evidence?
class
How can GSR help investigators?
It may indicate that someone fired, handled, or was near a recently fired gun
Marks transferred from the firearm's breech face onto the cartridge case
breech markings
What is the chemical symbol for gold?
Au
A shoe print made in soft dirt, mud, or concrete is called what type of print?
Plastic impression
Why do individual characteristics of shoes and tires change over time
Wear, damage, and use change their patterns
What are the three main parts of a cartridge?
Bullet, casing, and primer
What physics law explains why cartridge cases receive breech face markings?(Newton)
Newtons 3rd laws
How many sides does a hexagon have?
What three things can shoeprints tell investigators?
Shoe size, brand/type of shoe, and direction or pattern of movement
What are the patterns on a tire called?
tread patterns
What are the markings on a bullet that can be unique to a firearm called?
Striations
Can someone test positive for GSR without firing a gun?
yes
What is the largest ocean on Earth?
Pacific ocean
Most of the time, shoeprints are used to ______ suspects.
Eliminate
What is the distance between the outside edges of two tires called?
track width
What is the mixture of powders used in guns and explosives called?
Gunpowder
How long does GSR typically remain on a person's hands?
a few hours
Which country gifted the Statue of Liberty to the United States?
France