PPT-Trace Evidence : Hairs and Fibers

Chapter 10 Trace Evidence A category of physical evidence which includes any small pieces of material manmade or naturally occurring Most common examples Hair Fiber Forensic Use of Hair Although it is not yet possible to individualize a human hair to any single head or body through its morphology it still has great value as physical evidence. 2. Fibers. Are considered class evidence. Have probative value. Are common trace evidence at a crime scene. Can be characterized based on comparison of both physical and chemical properties. . Identification . Are considered class evidence. Are common trace evidence at a crime scene. Can be characterized based on comparison of both physical and chemical properties . Fabric. Fabric is made of fibers. . Fibers are made of twisted filaments called yarn.. 2. Copyright © Texas Education Agency 2011. All rights reserved.. Images and other multimedia content used with permission. . Copyright and Terms of Service. Copyright © Texas Education Agency, 2011. . Evidence. Human hair is one of the most frequently . found. pieces of evidence at the scene of a violent crime. Unfortunately, hair is not the best type of physical evidence for establishing . identity. Hair. NS2232 - Littlefield. Trace Evidence--any small pieces of material, man-made or naturally occurring. Most common examples:. Hair. Fiber. NS2232 - Littlefield. Questions for Trace Evidence. What is it?. H. umphreys. What Is Trace Evidence?. Trace evidence is the materials or markings that are left behind when different objects or materials come into contact with one another.. This usually occurs due to friction.. Textile . Fiber Defined. Defined as the smallest part of a textile material. Many objects in our environment (clothing, ropes, rugs, blankets, etc.) are composed of yarns made of textile fibers. Textile Fiber Categories. .. EQ: What is the structure of hair fiber?. Read . the case study on pg363 . (. blue book), . pg. 420 (orange), . and write and answer the following questions.. What happened to the “Central Park Jogger”?. Hairs and Fibers. FORENSIC SCIENCE: An Introduction by Richard Saferstein. 1. Introduction. Hair. is encountered as . physical evidence. . in a wide variety of crimes.. Although it is not yet possible to individualize a human hair to any single head or body through its morphology, it still has value as physical evidence.. Chapter 11. Hair as . Evidence. Human hair is one of the most frequently . found. pieces of evidence at the scene of a violent crime. Unfortunately, hair is not the best type of physical evidence for establishing . Bellringer. Learn the three main parts of hair and how they can be used to identify the difference between human and animal hair.. Objective. Criminals do not intentionally leave hair evidence behind, and hair is not used to commit a crime (like a knife might be). found. pieces of evidence at the scene of a violent crime. Unfortunately, hair is not the best type of physical evidence for establishing . identity. . It is not possible to show with any certainty that two hairs came from the same person or animal. However, hair can be used to . http://media.popularmechanics.com/images/PMX0706FORENSICSHairSmall.jpg. Presentation developed by T. Trimpe 2006 http://sciencespot.net/. Hair . shape. (round or oval) and . texture. (curly or straight) is influenced heavily by . SFS2. Students will use various scientific techniques to analyze physical and trace evidence. .. b. Analyze the morphology and types of hair, fibers, soil and glass. . SFS1. Students will recognize and classify various types of evidence in relation to the definition and scope of Forensic Science. .