Unit 5: Hair. Hair is the most frequently found piece of trace evidence. Hair is usually Class...

Unit 5: Hair

Hair is the most frequently found piece of trace evidence.

Hair is usually Class evidence unless:DNA in root is found = individual Sometimes mtDNA testing can be done (still class evidence but more narrowed)

Objective: SWBAT identify forensic evidence found in hair samples.

From hair one can determine:

Human vs animal?

Race (sometimes)

Location of hair on body (head, leg...)

Was hair was forcibly removed ?

Was hair treated with chemicals?

Were drugs/ toxins ingested?

Individualized if root is present (DNA)

Things hair can’t determine:• Age (except infant hair)• Gender (unless DNA in root)

Hair is composed of three principal parts (sketch in your notes):

Cuticle

Cortex Medulla

The cuticle is the outside covering made of overlapping scales.

Scales point down towards tip (older part) of hair.

3 Basic Patterns of Cuticle

Cuticle Structure: Coronal

Scales stacked like paper cups (draw a pic in notes)

Non human…. Ex. Bat Hair

Cuticle Structure: Spinous

Scales shaped like petals (draw a pic in notes)

Non human…. Ex. Rabbit Hair

Cuticle Structure: ImbricateScales flattened and close together (draw a

pic in notes)

Human hair has imbricate structure

Complete Activity: observing the cuticle

Closure: What class evidence is found when observing hair? (use notes form yesterday)

Read the case study of Wayne Williams and hand in the questions and reading.

Objective: SWBAT identify forensic evidence found in hair samples in a

real life crime story.

Hair structure

Medulla3 types in Humans: 1. Continuous2. Interrupted3. Fragmented/Absent

Medulla: ContinuousFormed as a solid center line

Medulla: InterruptedMedulla is seen as individual cells or fragments in repeating intervals

Medulla: Fragmented/ Absent

Fragmented: few parts visible

Absent: no medulla visible

Animal Vs. Human

The medullary Index is the ratio of diameter of medulla to the overall diameter of the hair

Medullary index:Humans < 1/3Animal > 1/2

Complete activity: observing the medulla

Closure: What is the medullary index?

Objective: SWBAT identify forensic evidence found in

hair samples.

Naturally Shed Hair: rounded

Objective: SWBAT determine the condition of hair and generate an

idea on how it was lost.

Forcible Removal of Hair: bent or pointed

Burned Hair: black and bent

Toxicology

Hair grows approximately 0.5 inches (1.3cm) per month.

1cm 2cm 3cm 4cm

Complete the toxicology worksheet and hand in.

Closure: What is the most interesting thing you have learned about hair in this class so far?

Video:

Read the “Central Park Jogger” case study and fill out the worksheet. Hand it in.

Closure: How can hair samples help put someone in jail?

How can you tell the difference between human and animal hair?

Complete the Hair Lab and hand in.

Closure: Hair is the most commonly found piece of forensic evidence found at a crime scene but it is not individual evidence. List some individual evidence that may be found at a scene.

Unit 5: Hair. Hair is the most frequently found piece of trace evidence. Hair is usually Class...

Documents

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Hair and Fiber Evidence - Fall River Public Schoolssavvy.fallriverschools.org/uploads/plee/2012-2013/Forensics/Hair...•Describe the nature of hair and fiber evidence ... Can have

Chapter 9: Trace Evidence - Richmond County School System · Trace Evidence Trace evidence is physical evidence found in small amounts at a crime scene. Common examples would be hair,