![]() (T or F) Dental work and dental impressions can be matched to a particular subject. (T or F) The front and rear track width of a vehicle is always the same. (T or F) The turning diameter of a beetle is greater than that of a sedan. Just as in fingerprints, the minute details in each and every tire and article of footwear can be used to identify an unknown crime scene impression to a known article of footwear or a tire.įootwear Forensics: New Techniques to Analzye Footwear TreadsĪ new computer algorithm can analyze the footwear marks left at a crime scene according to clusters of footwear types, makes and tread patterns even if the imprint recorded by crime scene investigators is distorted or only a partial print. (T or F) Tire patterns are generic and difficult to trace. Richard Souviron, testified that a bite mark found on one of his victims perfectly matched an impression made of Bundy's teeth. Bite mark pattern comparisons (generally seen as bruising on human skin) were first introduced via a burglary. Bite mark evidence was also used to convict him a science that's now quite controversial and largely discredited. A discussion of castings is also included.įirearms, Toolmarks and Other Impressions This chapter follows the theme of this book, shows the evolution of another police science, and focuses on a specific type of pattern and impression evidence which entered the US legal system in 1954 ( Texas v. This lesson from the National Museum of Crime & Punishment provides photos and analysis of shoe impressions and bitemarks used in crime scene analysis. Toolmarks are an impression left by an object, scrape marks, shearing marks, etc. From įrom Purdue University Forensic Science Department. Shoeprints, tool marks, tire tracks, bite marks, and marks on a fired bullet are several examples of impression evidence. The advent of DNA analysis and its recovery from bite marks has offered an objective method of bite mark analysis. Scottish Police Forensic Servicesįootprints, Tire Tread and Tool Marks. This type of impression evidence can be left in the skin of a victim and also can be in food, chewing gum and other miscellaneous items such as pens and pencils. Tools are often used by criminals to force entry to premises and can leave behind evidence for the forensic scientist to find. Information from Forensic Science Central Pattern evidence may be additional identifiable information found within an impression. ![]() Describes the types of impression evidence and provides examples of the different kinds. Typically impression evidence is either two-dimensional such as a fingerprint or three-dimensional such as the marks on a bullet caused by the barrel of a firearm. ![]()
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