PPT-Trace Evidence l: Hairs and Fibers

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 . Tony Hoare. Ian Wehrman . Traces. Trace: set of events + dependency relation. an execution of a program. tr. Trace Separation. W. eak separation . (*). tp. * . tq. . =. . tp. U . tq. . . when . 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 . Min Li . and. Azadeh Davoodi. Department of Electrical and Computer Engineering . University of Wisconsin-Madison. . W. ISCAD.  . Electronic Design . Automation Lab. http://. wiscad.ece.wisc.edu/. 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. . 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?. 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”?. b. Distinguish and categorize physical and trace evidence (e.g. … hair). SFS2. Students will use various scientific techniques to analyze physical and trace evidence.. . b. Analyze the morphology and types of hair.. Leave No Trace in BSA Advancement and Awards. Goal:. As a result of this session, each participant will be able to discuss references to Leave No Trace in the Cub Scout, Scouts BSA, and Venturing Advancement and Awards programs.. 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). 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. . Chapter 10. Trace Evidence. A category of physical evidence which includes any small pieces of material, man-made 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..