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. We have that AA 1 that is that the product of AA is the sum of the outer products of the columns of To see this consider that AA ij 1 pi pj because the ij element is the th row of which is the vector a a ni dotted with the th column of which is Training for Cub Scouts . A nationally recognized outdoor skills and ethical awareness program. CUB SCOUTS. Leave No Trace is a plan that helps you to be more concerned about your environment. It also helps you protect it for future generations. Hairs. Human Hair Is . Class. Evidence. Asian. European. African. Human Hair As Class Evidence. Can often determine body area of origin. Can determine shed vs. forcibly removed. Can often determine racial origin. 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.. Ms Clark, 2014. PVMHS. Hair evidence. What information can be gained from analysis of hair?. Hair alone (without follicle cells) is . trace evidence . & . class evidence. .. It does not identify a specific individual, but can narrow your suspects down based of certain characteristics of their hair.. 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.. 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”?. Can only compare head hair to head hair. or . pubic hair to another pubic hair. Control hairs from suspect:. 50 full length head hairs. minimum of 24 pubic hairs. HAIR . is useful as forensic evidence because its protein polymers are…. 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 .