![]() The method used to collect the impression evidence depends largely on how the impression was made and on what kind of surface. A three-dimensional impression is made when the surface over which the shoe passed was soft and the sole actually sank into it. ![]() Sometimes wet deposits on a sole will adhere to such a surface. The impression comes from static charge on the sole transferring particles from the sole to the surface. ![]() An object like the sole of a shoe will leave a two dimensional impression on a hard surface such as a tiled floor. Impressions may be found in either two or three dimensions. There is a need for the forensic scientist to retain as much information as possible when collecting impression evidence. Impression evidence is often fragile a tire track may deteriorate or even be destroyed by rainfall, for example. Collection of an impression is a specialized forensic task because, unlike a hair or bullet, an impression cannot just be packaged and taken back to the lab. Impressions can be found in a variety of surfaces including dust, carpet, mud, and, very significantly, blood. ![]() The major types of impression evidence are shoeprints, tire tracks, tool marks and the marks that are found on a fired bullet. The collection and analysis of impression evidence found at the scene of a crime can often be very important to an investigation. When an item like a shoe or a tire comes into contact with a soft surface, it leaves behind a pattern showing some or all of its surface characteristics known as an impression. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |