JS 96GY: Trace evidence- Hairs, Fiber and Paint I.Announcements, Assignments and Acknowledgements II.Learning Objectives (Chapter 7) a.Hair 1.Describe.

Slides:



Advertisements
Similar presentations
Hair as Physical Evidence
Advertisements

Trace Evidence: Hair Encountered at crime scenes Not good for “individualization” of physical evidence 1. No distinctive chemical properties 2. Although.
10-1 PRENTICE HALL ©2008 Pearson Education, Inc. Upper Saddle River, NJ FORENSIC SCIENCE An Introduction By Richard Saferstein Trace Evidence l:
Identify the various parts of a hair
Words to Know  Cuticle  Cortex  Medulla  Anagen phase  Catagen phase  Telogen phase  Follicular tag  Trichology  Melanin granules.
8- PRENTICE HALL ©2007 Pearson Education, Inc. Upper Saddle River, NJ CRIMINALISTICS An Introduction to Forensic Science, 9/E By Richard Saferstein.
Forensics of Hair Analysis. Objectives After studying this chapter you should be able to: Recognize and understand the cuticle, cortex, and medulla areas.
Hair and Fiber Analysis
8- PRENTICE HALL ©2007 Pearson Education, Inc. Upper Saddle River, NJ CRIMINALISTICS An Introduction to Forensic Science, 9/E By Richard Saferstein.
Chapter 3 SFS1. Students will recognize and classify various types of evidence in relation to the definition and scope of Forensic Science SFS2. Students.
Forensic Analysis of Hair
Chapter 8 Hairs & Fibers.
10-1 PRENTICE HALL ©2008 Pearson Education, Inc. Upper Saddle River, NJ FORENSIC SCIENCE An Introduction By Richard Saferstein Trace Evidence l:
HAIR, FIBERS, AND PAINT.
Trace Evidence l: Hairs
Chapter 3: The Study of Hair Day 1
11-1 ©2011, 2008 Pearson Education, Inc. Upper Saddle River, NJ FORENSIC SCIENCE: An Introduction, 2 nd ed. By Richard Saferstein Trace Evidence.
NOVEMBER 13, 2012 STANDARD: SFS2b-Analyze the morphology and types of hair, fibers, soil and glass. EQ: What is the structure of hair fiber? Read the.
Chapter 5 Introduction Human hair is one of the most frequently found pieces of evidence at the scene of a violent crime. It can provide a link between.
+ Intro to Hair and Fiber Evidence Forensic Science 4/13/15.
TRACE EVIDENCE: HAIR. Anatomy of a Hair Cortex  Largest portion of the shaft  Contains hair pigment Cuticle  Layer of cells that cover the surface.
Forensics of Hair Analysis
Honors Forensic Science Wed., 1/29/14
HAIR.
The Study of Hair. Objectives The student will be able to: Identify the various parts of a hair. Describe variations in the structure of the medulla,
Hairs Trace Evidence.
Hair and Fiber Analysis. Introduction Color Structure Morphology Used to be the most useful forensic characteristics DNA is now obtained from cells in.
8 th Grade Forensic Science Presentation developed by T. Trimpe 2006
Intro to Hair Analysis Forensic Science 3/13/14.
Identify the various parts of a hair
10 Hairs and Fibers.
JS 113: Trace evidence- Hairs, Fiber and Paint I.Announcements, Assignments and Acknowledgements II.Learning Objectives (Chapter 8) a.Hair 1.Describe cuticle,
IDENTIFICATION AND COMPARISON OF HAIR Hair Note No.2.
Hair Evidence. Hairs as physical evidence Valuable because can remain intact for years So strong that they have same tensile strength of steel of same.
CJO3 EOC Review Hairs and Fibers. O – Describe hair and fiber identification procedures.
Forensic Science: Fundamentals & Investigations, 2e Chapter 3 1 All rights Reserved Cengage/NGL/South-Western © 2016.
Microscopy. Important microscopy terms “Real” and “virtual” image “Real” and “virtual” image “Transmitted” or “reflected” light “Transmitted” or “reflected”
What happened to the “Central Park Jogger”?
Trace Evidence l: Hairs and Fibers
Hair and Fiber Evidence Unit 2A
Hairs Trace Evidence.
Hair Forensics.
Chapter 3: The Study of Hair Day I
All rights Reserved Cengage/NGL/South-Western © 2016.
Hairs Forensic Science
Chapter 8 HAIR, FIBERS, AND PAINT
Chapter 13: Trace Evidence I: Hairs and Fibers 1.
All rights Reserved Cengage/NGL/South-Western © 2016.
Trace Evidence 1: Hairs & Fibers
Trace Evidence l: Hairs and Fibers
Hair Class Evidence.
STL 175 – Forensics Professor Mastromarco
NOVEMBER 13, 2012 STANDARD: SFS2b-Analyze the morphology and types of hair, fibers, soil and glass. EQ: What is the structure of hair fiber? Read the.
Hair Evidence Forensic Science 1.
Analyzing Hairs Forensic Science.
All rights Reserved Cengage/NGL/South-Western © 2016.
Hairs Trace Evidence.
Hairs and fibers Differences Similarities: Both are… March
Wednesday January 17, 2018 (Discussion – Trace Evidence I – The Forensics of Hair; Morphology of Hair)
The Forensic Analysis of Hair
Trace Evidence I: Hairs and Fibers
Hair and Fiber Evidence Unit 2A
Trace Evidence I: Hair and Fibers
Analyzing Hairs Forensic Science.
Trace Evidence l: Hairs and Fibers
Hair Morphology 12/3/18.
Trace Evidence I: Hairs and Fibers
Trace Evidence.
Trace Evidence I: Hairs and Fibers
The Study of Hair Chapter 3
Presentation transcript:

JS 96GY: Trace evidence- Hairs, Fiber and Paint I.Announcements, Assignments and Acknowledgements II.Learning Objectives (Chapter 7) a.Hair 1.Describe cuticle, cortex and medulla and 3 growth phases 2.Explain distinction between human vs animal hair 3.List useful macro and microscopic hair features 4.Explain proper collection of hair evidence 5.Describe the role of DNA typing in hair comparisons b.Fibers 1.Classify fibers 2.Describe the structure of a polymer 3.List useful forensic properties of fiber 4.Explain proper collection of fiber evidence c.Paint 1.Describe the components of paint 2.Classify auto paints 3.List those examinations most useful for forensic comparison of paint 4.Explain proper collection of paint evidence

Assignments and Acknowledgements Collect Assignments- Chapter summaries and extra credit Reminders- Final Exam- Monday 15 Dec CSI Notebooks due - Weds 10 Dec 08 MUSE workshops- Weds 10 Dec 08 Bring hard copies of summaries this weds 10 Dec and post handouts and powerpoints to Google group Assignments Prepare Student led reviews Study for final exam SOTEs Weds 10 Dec Acknowledgements –Marty Blake- SFPD –Jeremiah Garrido and Larry Turner: SCCCL

Summary 1 Trace evidence includes Animal (hair), Vegetable (fiber), or Mineral (glass, explosives, gunshot residue) – It is fragile, easily missed and/or lost. Hairs extend from its root in the follicle into a shaft and terminates at a tip end- Three layers of the hair, the cuticle, cortex and medulla are subjected to the most intense forensic examination - Color, length and diameter Morphological features distinguish human vs animals Scale structure, medullary index and medullary shape are important Medullary shape and the distribution, shape and color intensity of the pigment granules present in the cortex are important forensic features. Nuclear and mtDNA can be analyzed from hair roots and mtDNA from hair shaft

Summary 2 The quality of fiber evidence is dependent on the ability of the criminalist to identify the origin or narrow down the number of sources Microscopic comparisons of known and questioned fibers at undertaken for color and diameter. Striations on the fiber, delustering particles and cross-sectional shape are examined. Visible light micro-spectrophotometer and FT-IR IR spec is rapid and reliable for identifying the generic class of fibers. Paint consists of pigments and additives suspended in the binder. Auto paint is compared under a stereoscopic microscope for color surface texture and color layer. Pyrolysis GC and IR spec can be used to distinguish most paint binder formulations