Impression evidence includes any markings produced when one object comes into contact with another, leaving behind some kind of indentation or print. Such evidence encountered includes footwear impressions, tyre marks, and markings created by tools and similar instruments. Footwear Impressions Whenever an individual takes a step, a footwear impression may potentially be left behind on the surface. Such an impression may be two-dimensional, the print left behind on a flat surface in some deposited material, or three-dimensional, formed in a soft surface such as soil.
How Impression Evidence Works | HowStuffWorks
This article was published more than 10 years ago. Some information in it may no longer be current. Perched on the edge of ice-encrusted Lake Stoco, a short drive outside this placid town north of Belleville, the sprawling bungalow Col. Williams, 46, owns with his wife, Mary Elizabeth Harriman, would look like any other rural property were it not for the yellow police tape and the forensics truck. In sleepy Tweed, a community that includes many retired people, farmers and people who commute to Belleville, the mounting alarm that followed a pair of disturbing assaults last September and peaked with the disappearance of Jessica Lloyd in late January is slowly subsiding. There was quiet panic in the community when rumours began to circulate about the nature of the two sex assaults in September of a woman in her 40s and another about 20 years younger. Both victims lived alone, and both attacks occurred in the dead of night.
The tire track that broke the case wide open
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How can you make sure that you start off on the right foot in any of these scenarios? What should you actually say? Sit up straight.