1/9/2024 0 Comments Impression evidence worksheetrunning) as well as estimate the size of a person based on the impression’s depth. Depending on the quality of the impression, investigators may be able to determine a person’s speed (walking vs. Databases of shoe prints are available for investigators to help them determine the brand of shoe to provide leads for a case. They will also look for individual characteristics, such as wear patterns and specific damages or defects. Shoe Print Evidence Investigators can analyze a shoe print to determine its class, or the type and brand of shoe. Features to analyze: Dimensions of the impression Ridges or striation patterns Defects, such as nicks and chips Paint chips or metal shards left on a tool Images: and NOTE: Some tool marks are a combination of both types. Scratches – As a tool moves across a surface, it may leave ridges or striations behind. Tool marks can be classified two ways: Impressions – As a tool hits a softer surface, the shape of the tool and imperfections in its surface may be left behind as an impression. Images:ĥ Tool Mark Evidence Certain defects or patterns may be left on a tool when it is made or used, which can be used to find matches between evidence at a crime scene and tools or objects found at a suspect’s home. Features to analyze: Tread pattern Width & depth of the tread pattern Unique characteristics due to the wear pattern or defects Tire databases are available help investigators determine the brand and model of the tire that left the impression, which can be used to determine the type of vehicle that made the tracks. They will also take photographs that can later be used to prove a match. Investigators may make ink prints of a tire or plaster casts of a track. Tracks help investigators identify the type of vehicle that left them. Example of Shoe Print in Bio-Foam Impression Foam Images:Ĥ Tire Track Evidence Tire tracks are important in forensic investigations and are usually found in road accident scenes or in the access and escape routes of other crime scenes. 3-D: This type of impression can be documented using photography as well as by casting, which involves using dental stone or a similar substance to preserve the dimensional characteristics of the print. They may also be collected using an electrostatic dust lifting process. Some impressions may be dusted with fingerprint powder to be photographed or lifted with tape. Collection of impression evidence can be accomplished using several methods: 2-D: This type of impression is documented using photography. The quality of the impression depends on the object making the impression and the surface conditions, such as how hard or soft it is and what type of material it is (soil, mud, dust, concrete, grass, skin, etc.) CSI & Impressions Images: andģ Example of Shoe Print in Bio-Foam Impression FoamĬollection Methods Investigators analyze the impression evidence to find unique characteristics to link shoes, tires, tools, and other objects found in a suspect’s possession to evidence at a crime scene. Impressions may be found in or on many different types of materials. Shoeprints, tool marks, tire tracks, bite marks, and marks on a fired bullet are several examples of impression evidence. Impressions are created when one object is pressed against another material with enough force to leave an impression of the object. Impression evidence can be defined as objects or materials that have retained the characteristics of other objects through direct contact. Presentation on theme: "“Impressive” Evidence"- Presentation transcript:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |