Chapter 22: Impression Evidence

Recipients

Made of a material that can form and hold a negative image of the donor markings.

Wheelbase

The distance from the center of the front hub to the center of the rear hub of a motor vehicle.

Stance

The distance from the centerline of the right tire to the centerline of the left tire.

Imprint

Where there is enough residue on the footwear to leave an impression on the recipient surface.

Dental Plasters and Stones

casting materials that are denser and have more uniform, smaller particle size; they dry more quickly and show more detail.

Footwear impressions

________ can indicate the type, manufacturer, model, and often, the exact size of the footwear.

serial number

When a(n) ________ is stamped into a metal, two things happen to the metal under the number.

Impression Evidence

Evidence at a crime scene that results from the criminal leaving marks or prints of some kind on surfaces or materials like soil or dust.

Known bite marks

________ are generally obtained by use of an impression of the teeth in dental stone or a similar medium.

Tread

The part of a modern tire that is in contact with the road.

Electrostatic lifting devices

A large, static electricity charge will strongly attract dust and other fine powders.

Snow print wax

It is sprayed on the snow print and dries in a few minutes; it shows excellent detail but fragile