Casts and Impressions

What must first be done with impression evidence?

• make a cast using plaster or dental stone
• cut out the area with the impression
• photograph it with a ruler
• place the item that made the impression over it to see if it's a match

A shoe impression is left in paint at a crime scene.  What type of impression is this?

• Patent
• Latent
• Plastic
• Lasting

A tire track is left sunk into the mud.  What type of impression is this?

• Patent
• Latent
• Plastic
• Lasting

A footprint is left in dust at a crime scene and was only found due to electrostatic lifting.  What type of impression is this?

• Patent
• Latent
• Plastic
• Lasting

What factors CANNOT be determined from a car based on impression evidence?

• Front and rear track width
• Wheelbase measurement
• Turning diameter
• Person driving the car

Current views of bite mark analysis is/are:

• not very reliable because they never have a full bitemark with all teeth
• secondary to DNA from possible saliva in the bitemark
• it's not individual evidence
• all of these

Shoe and tire marks impressed into soft earth can be best preserved by: 

• photographing and casting with dental stone
• photographing and then use of the electrostatic lifting technique.
• It is not possible to accurately preserve such markings
• dusting with powder

Class characteristics of shoe prints include:

• manufacturer, tread, model, and size

• color, material, scent, and scratches on the bottom

• depth of tread, position, quantity

• accidental scratches, embedded rocks or debris

 What are yaw marks and how are they formed?

• made when a vehicle drives on mud, sand, or snow.
• occur when a car travels over a liquid such as paint, blood, or tar.
• Sideways skid marks, produced when a vehicle turns faster than it can handle

The design on the surface of a tire is known as _____________

• Ridge pattern

• Tread pattern

• Tire grooves

• Tire impressions