Forensics of Hair Analysis Hair Forensics Hair Can
![Forensics of Hair Analysis Forensics of Hair Analysis](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-1.jpg)
![Hair Forensics • Hair: – Can demonstrate physical contact with Person Place Object Hair Forensics • Hair: – Can demonstrate physical contact with Person Place Object](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-2.jpg)
![Hair Facts • Grows from the papilla…but past that, it’s dead cells and protein Hair Facts • Grows from the papilla…but past that, it’s dead cells and protein](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-3.jpg)
![Hair: Components • Keratin (a protein) • Melanin (a pigment) • Trace metals – Hair: Components • Keratin (a protein) • Melanin (a pigment) • Trace metals –](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-4.jpg)
![Basic Hair Structure Basic Hair Structure](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-5.jpg)
![Hair Cuticle • Translucent outer layer of the hair shaft consisting of scales… … Hair Cuticle • Translucent outer layer of the hair shaft consisting of scales… …](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-6.jpg)
![Cuticle • There are three basic scale structures that make up the cuticle • Cuticle • There are three basic scale structures that make up the cuticle •](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-7.jpg)
![Bat Hair and Mink Hair Bat Hair and Mink Hair](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-8.jpg)
![Human Hair • Imbricate or “flattened” scales show overrlapping scales with narrow margins. • Human Hair • Imbricate or “flattened” scales show overrlapping scales with narrow margins. •](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-9.jpg)
![Medulla • The medulla is a central core of cells that may be present Medulla • The medulla is a central core of cells that may be present](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-10.jpg)
![Medulla • When present in human hairs: – Generally less than 1/3 the diameter Medulla • When present in human hairs: – Generally less than 1/3 the diameter](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-11.jpg)
![Animal vs. Human Hairs Human hairs Color consistent the length of the shaft Pigmentation Animal vs. Human Hairs Human hairs Color consistent the length of the shaft Pigmentation](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-12.jpg)
![Hair Forensics: DNA • Often it is not possible to extract DNA fully, or Hair Forensics: DNA • Often it is not possible to extract DNA fully, or](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-13.jpg)
![Forensic Identification • Human hairs can generally be identified by racial origin and body Forensic Identification • Human hairs can generally be identified by racial origin and body](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-14.jpg)
![Caucasian African. American Mongoloid Asian Caucasian African. American Mongoloid Asian](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-15.jpg)
![Where is this hair from? • Certain features of individual hairs identify the region Where is this hair from? • Certain features of individual hairs identify the region](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-16.jpg)
![Where is this Hair from? Limb Where is this Hair from? Limb](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-17.jpg)
![Where is this hair from? Beard triangular in cross-section Where is this hair from? Beard triangular in cross-section](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-18.jpg)
![Things to consider when viewing hair • Length: – May have been cut – Things to consider when viewing hair • Length: – May have been cut –](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-19.jpg)
![• Glass. Cut or Broken Hair Tip • Cut Hair Tip • Worn • Glass. Cut or Broken Hair Tip • Cut Hair Tip • Worn](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-20.jpg)
![Dyed hairs possess an unnatural cast or color. In addition, the cuticle will take Dyed hairs possess an unnatural cast or color. In addition, the cuticle will take](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-21.jpg)
![• Scissor Cut • Razor Cut • Broken Hair • Burned Hair • Scissor Cut • Razor Cut • Broken Hair • Burned Hair](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-22.jpg)
![What is this? What is this?](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-23.jpg)
![Joann Joann](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-24.jpg)
- Slides: 24
![Forensics of Hair Analysis Forensics of Hair Analysis](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-1.jpg)
Forensics of Hair Analysis
![Hair Forensics Hair Can demonstrate physical contact with Person Place Object Hair Forensics • Hair: – Can demonstrate physical contact with Person Place Object](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-2.jpg)
Hair Forensics • Hair: – Can demonstrate physical contact with Person Place Object
![Hair Facts Grows from the papillabut past that its dead cells and protein Hair Facts • Grows from the papilla…but past that, it’s dead cells and protein](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-3.jpg)
Hair Facts • Grows from the papilla…but past that, it’s dead cells and protein – no DNA • A shaft projects above the skin, and a root that is imbedded in the skin
![Hair Components Keratin a protein Melanin a pigment Trace metals Hair: Components • Keratin (a protein) • Melanin (a pigment) • Trace metals –](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-4.jpg)
Hair: Components • Keratin (a protein) • Melanin (a pigment) • Trace metals – Deposited in the hair during its growth – Absorbed from the external environment. • After a period of growth, the hair remains in the follicle in a resting stage to eventually be sloughed from the body.
![Basic Hair Structure Basic Hair Structure](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-5.jpg)
Basic Hair Structure
![Hair Cuticle Translucent outer layer of the hair shaft consisting of scales Hair Cuticle • Translucent outer layer of the hair shaft consisting of scales… …](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-6.jpg)
Hair Cuticle • Translucent outer layer of the hair shaft consisting of scales… … always point from the root end of the hair to the distal or tip end of the hair.
![Cuticle There are three basic scale structures that make up the cuticle Cuticle • There are three basic scale structures that make up the cuticle •](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-7.jpg)
Cuticle • There are three basic scale structures that make up the cuticle • Combinations and variations of these types are possible. Imbricate, Flattened Spinous, Petal-like Coronal, Crown-like
![Bat Hair and Mink Hair Bat Hair and Mink Hair](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-8.jpg)
Bat Hair and Mink Hair
![Human Hair Imbricate or flattened scales show overrlapping scales with narrow margins Human Hair • Imbricate or “flattened” scales show overrlapping scales with narrow margins. •](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-9.jpg)
Human Hair • Imbricate or “flattened” scales show overrlapping scales with narrow margins. • Can show on many animal hairs.
![Medulla The medulla is a central core of cells that may be present Medulla • The medulla is a central core of cells that may be present](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-10.jpg)
Medulla • The medulla is a central core of cells that may be present in the hair. Human Animal Deer
![Medulla When present in human hairs Generally less than 13 the diameter Medulla • When present in human hairs: – Generally less than 1/3 the diameter](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-11.jpg)
Medulla • When present in human hairs: – Generally less than 1/3 the diameter of the hair shaft. • In animal hairs: – Normally continuous – Generally more than 1/3 the diameter of the hair shaft.
![Animal vs Human Hairs Human hairs Color consistent the length of the shaft Pigmentation Animal vs. Human Hairs Human hairs Color consistent the length of the shaft Pigmentation](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-12.jpg)
Animal vs. Human Hairs Human hairs Color consistent the length of the shaft Pigmentation evenly distributed, or slightly more dense toward the cuticle Animal hairs May exhibit radical color changes in a short distance, called banding. The pigmentation is more centrally distributed, perhaps although more dense toward the medulla.
![Hair Forensics DNA Often it is not possible to extract DNA fully or Hair Forensics: DNA • Often it is not possible to extract DNA fully, or](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-13.jpg)
Hair Forensics: DNA • Often it is not possible to extract DNA fully, or there is not enough tissue present to conduct an examination. • DNA examinations destroy hairs, eliminating the possibility of further microscopic examination.
![Forensic Identification Human hairs can generally be identified by racial origin and body Forensic Identification • Human hairs can generally be identified by racial origin and body](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-14.jpg)
Forensic Identification • Human hairs can generally be identified by racial origin and body area. • Racial indicators apply primarily to head hairs.
![Caucasian African American Mongoloid Asian Caucasian African. American Mongoloid Asian](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-15.jpg)
Caucasian African. American Mongoloid Asian
![Where is this hair from Certain features of individual hairs identify the region Where is this hair from? • Certain features of individual hairs identify the region](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-16.jpg)
Where is this hair from? • Certain features of individual hairs identify the region of the body where it originated.
![Where is this Hair from Limb Where is this Hair from? Limb](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-17.jpg)
Where is this Hair from? Limb
![Where is this hair from Beard triangular in crosssection Where is this hair from? Beard triangular in cross-section](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-18.jpg)
Where is this hair from? Beard triangular in cross-section
![Things to consider when viewing hair Length May have been cut Things to consider when viewing hair • Length: – May have been cut –](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-19.jpg)
Things to consider when viewing hair • Length: – May have been cut – May vary considerably within the individual • Tip: – May be affected by grooming and hygiene
![Glass Cut or Broken Hair Tip Cut Hair Tip Worn • Glass. Cut or Broken Hair Tip • Cut Hair Tip • Worn](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-20.jpg)
• Glass. Cut or Broken Hair Tip • Cut Hair Tip • Worn or Razor-Cut Tip
![Dyed hairs possess an unnatural cast or color In addition the cuticle will take Dyed hairs possess an unnatural cast or color. In addition, the cuticle will take](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-21.jpg)
Dyed hairs possess an unnatural cast or color. In addition, the cuticle will take on the color of the dye
![Scissor Cut Razor Cut Broken Hair Burned Hair • Scissor Cut • Razor Cut • Broken Hair • Burned Hair](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-22.jpg)
• Scissor Cut • Razor Cut • Broken Hair • Burned Hair
![What is this What is this?](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-23.jpg)
What is this?
![Joann Joann](https://slidetodoc.com/presentation_image/0deb4693bb76d259521b92614bd5ceb0/image-24.jpg)
Joann
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