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Types

There are many types of impression evidence. These include tire tracks, tool marks, footwear, and bite marks. We will concentrate on tire tracks, footwear, and tool marks in this lesson.

Impression evidence is created when an object retains another object's characteristics through direct contact. In order for an impression to be left behind, an object must have enough force to leave an impression.

There are several different methods of collecting impression evidence. A 2-D impression skidmarks on highway must be documented using a photograph. Fingerprint powder may also be used on this type of impression evidence. The impression can then be photographed or lifted.

A 3-D impression tire treds in the sand is photographed and casted using either dental stone or other substance to preserve the dimensional characteristics of the print.

Read A simplified Guide to Footwear & Tire Track Examination: How It's Done.

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Research

Now it is time for you to do some research on your own. Check out the following sites and learn more about impression evidence.

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