IDENTIFICATION AND COMPARISON OF HAIR Hair Note No.2.

Slides:

Advertisements

Similar presentations

Advertisements

Hair as Physical Evidence

So really, what can we find out from hair?.  Hair can be very valuable to forensic scientists.  Need to be familiar with hair structure and chemistry.

Forensic Analysis of Hair

Trace Evidence: Hair Encountered at crime scenes Not good for “individualization” of physical evidence 1. No distinctive chemical properties 2. Although.

Unit # 4 - Hair1 Unit # 4 – Hair “For three days after death, hair and fingernails continue to grow, but phone calls taper off. - Johnny Carson Comedian.

Welcome back to Forensics Day 12 Please complete the Tobacco survey and pass up. Do not put your name on it. Working with a partner go to a station with.

TRACE ELEMENTS: HAIR AS EVIDENCE

{ Hair Analysis It’s Everywhere!!!.  Forensic hair examinations and comparisons are often used as important investigative and associative information.

Words to Know  Cuticle  Cortex  Medulla  Anagen phase  Catagen phase  Telogen phase  Follicular tag  Trichology  Melanin granules.

Hair Growth  Human hair diameter ranges from µm  Coarse hairs grow slower & fall out less frequently than fine hairs  Head hair grows about.

Hair & Fiber Analysis ©Anthony & Patricia Bertino.

Trace Evidence. What do you think trace evidence is? Materials that are small enough to be easily overlooked by a crime scene investigator They are so.

Hair Evidence Forensic Science Mr. Glatt,

Kendall/Hunt Publishing Company

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:

Trace Evidence l: Hairs

Hair 1. 2 Objectives You will understand that: Hair is class evidence. Hair can be used to back up circumstantial evidence. Hair absorbs and adsorbs substances.

Hair 1. 2 Objectives You will understand that: Hair is class evidence. Hair can be used to back up circumstantial evidence. Hair absorbs and adsorbs substances.

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.

Hair 1 ‡Most of trace evidence investigation involves:  hair  Fibers  Glass  Paint  Soil  Plant material Trace Evidence.

Topic: How is hair studied by a forensic scientist? Do Now:How often do you get your hair cut? How do people change the appearance of their hair? HW: Textbook.

Honors Forensic Science Wed., 1/29/14

Animal Hair. Why is animal hair important Evidence shows animal hair present— victim does not own a dog, could infer suspect owns a dog or has come in.

8.2 Notes – Hair continued. Objectives List hair features that are useful for microscopic comparison of human hairs Explain proper collection of forensic.

Hairs Trace Evidence.

Hair 1 Do Now: 1.Name the 5 fiber weave types. 2.What two parts of hair could be used to distinguish between ethnicities? 3.Describe the proper way to.

Hair and Fiber Analysis. Introduction Color Structure Morphology Used to be the most useful forensic characteristics DNA is now obtained from cells in.

Chapter 5 forensics_human_hairs_identi.htm Kendall/Hunt.

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 the criminal.

HAIR “For three days after death, hair and fingernails continue to grow but phone calls taper off.” —Johnny Carson Comedian and television host.

Chapter 5: Hair “For three days after death, hair and fingernails continue to grow but phone calls taper off.” —Johnny Carson Comedian and television host.

Hair……can you tell the difference?

Chapter 5: The Study of Hair “For three days after death, hair and fingernails continue to grow but phone calls taper off.” —Johnny Carson Comedian and.

Hair Evidence: Human vs. Animal

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.

Hair 1. 2 Objectiveshttp:// Body You will understand that: Hair is class evidence. Hair.

Hair and Fiber Analysis

What happened to the “Central Park Jogger”?

Kendall/Hunt Publishing Company

Hairs Trace Evidence.

Hair Forensics.

Hair as Evidence.

Chapter 5 Hair Kendall/Hunt.

Purpose for Hair Analysis

Trace Evidence l: Hairs and Fibers

Hair Class Evidence.

Chapter 5 Chapter 5: Hair “ Kendall/Hunt.

Hair Evidence Forensic Science 1.

“For three days after death, hair and fingernails continue to grow but

“For three days after death, hair and fingernails continue to grow but

“Hair today, gone tomorrow” -The Bald Man

Bell Question What does Locard’s Principle tell us and how is that important to Forensics Science? Answer on socrative.com Room Number:

Hairs Trace Evidence.

Chapter 5 Hair Kendall/Hunt.

Hair Analysis – Part I (Chapter 11)

The Forensic Analysis of Hair

“For three days after death, hair and fingernails continue to grow but

“For three days after death, hair and fingernails continue to grow but

Hair as Evidence.

Hair Morphology 12/3/18.

“For three days after death, hair and fingernails continue to grow but

“Hair today, gone tomorrow” -The Bald Man

Presentation transcript:

IDENTIFICATION AND COMPARISON OF HAIR Hair Note No.2

STEPS TO EXAMINE HAIR EVIDENCE  Upon finding hair at a crime scene, things to be done are: 1) Determine whether the hair originated from a human or animal: a) Use microscopic examination b) Need a comprehensive collection of controls c) Use scale structure, medullary index, and medullary shape to match hair samples

2) If human, compare the hair with hair from suspects and victims: a) Compare hair obtained from scalp or pubic area b) Perform DNA typing if skin or blood is left on a root, or have enough hair c) If no DNA typing can be performed, only some degree of probability can be made

HAIR FEATURES TO COMPARE  Color, length, and diameter of hair  The presence or absence of a medulla  The distribution, shape, and color intensity of the pigment granules in the cortex  Whether or not hair has been dyed or bleached, and the time passed since coloring

INFORMATION FROM EXAMINATION OF HUMAN HAIR  Race  Origin of body area  Treatment and Removal  Artificial treatment: dyes, and rinses  Forcibly removed or not  Cut or broken

OTHER INFORMATION ABOUT HAIR  Hair is know to grow at a rate of approximately one centimeter per month  The odds against a head hair originating from another person are about 4500 to 1.  The odds against two similar pubic hairs originating from two different individuals are about 800 to 1.

HUMAN HAIRS

ANIMALS HAIRS Horse HairDog HairCat HairMouse Hair Rabbit Hair Deer Hair Cow HairPig Hair

SPECIAL CONDITIONS OF HAIR Fallen Out Hairs Pulled Out by the Root

Natural Tips Broken / Torn Cut Hair