Tool Marks
Indentations marks are made by a tool when it is pressed against a softer surface, often forming this.
What is a negative impression?
Often there are no witnesses at a crime and no cameras to capture what happened, so detectives must rely on THIS to figure it out.
What is evidence?
Tire treads are ridges and _________ that channel water away from the wheel and provide traction for the vechile.
What is grooves?
One of the most distinct and long-lasting features of mammals.
What are teeth?
Primary ingredient in glass.
What is a college silica?
These type of marks are made when surfaces slide across one another.
What are abrasion marks?
Visible, two-dimensional marks formed from soil, dust, paint, blood, ink.etc.
What is patent impressions?
Can be used to link a suspect to a crime scene and also to help the crime scene investigators reconstruct the crime
What is tire evidence?
Teeth are not made of bone; the living layer of the teeth is __________
What is dentin?
Type of glass used in ovenware.
What is Pyrex?
These type of marks are produced along the edge as a surface is cut.
What are cutting marks?
Hidden to the naked eye but can be visualized through the use of dusting or electrostatic techniques.
What is latent impressions?
The distance from the __________ of one tire to the center of the other tire.
What is center?
Teeth are composed of these 2 minerals.
What is calcium and phosphorus?
TRUE or FALSE
Soda-lime glass is a type of glass that is inexpensive, easy to melt and shape, and the most commonly used type of glass.
TRUE
Photography of tool marks should include THIS for size reference.
What is a ruler?
Three-dimensional imprints left in pliable materials such as snow, mud, soil, or soap
What is plastic impressions?
The distance from the center of the front axle to the center of the rear axle.
What is the wheelbase?
The type of evidence that may be collected from a bite mark when it is swabbed for saliva.
What is individual evidence?
TRUE or FALSE
When a bullet passes through glass, the entrance hole will be larger than the exit hole.
FALSE
any impression, scratch, or abrasion made when contact occurs between a tool and an object.
What is a tool mark?
There is information that detectives can gain for a scene with numerous prints.....
1. the number of people at the scene
2. Movements of individuals at the scene
3. ??
What is the entrance and exit to the scene?
Tire marks can also give clues to ________ and _________ of the vehicle.
What is speed and direction?
Dental patterns are used in forensic science in these two main ways.
What is identify body remains and identify a suspect from bite marks left behind?
Glass has some _____________ and is able to stretch a tiny bit.
What is flexibility?