Unit 5: Hair.

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Presentation transcript:

Unit 5: Hair

Objective: SWBAT identify forensic evidence found in hair samples. 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) mtDNA done from mitochondria in shaft cells. Come from maternal blood line so not individual evidence but links to suspect and maternal side of family

From hair one can determine: Objective: SWBAT identify forensic evidence found in hair samples. From hair one can determine: Human vs animal? Were drugs/ toxins ingested? Race (sometimes) Individualized if root is present (DNA) Location of hair on body (head, leg...) Things hair can’t determine: • Age (except infant hair) • Gender (unless DNA in root) Was hair was forcibly removed ? Was hair treated with chemicals?

Objective: SWBAT identify forensic evidence found in hair samples. Hair is composed of three principal parts (sketch in your notes): Cuticle Cortex Medulla

Objective: SWBAT identify forensic evidence found in hair samples.

Objective: SWBAT identify forensic evidence found in hair samples. The cuticle is the outside covering made of overlapping scales. Scales point down towards tip (older part) of hair.

3 Basic Patterns of Cuticle Objective: SWBAT identify forensic evidence found in hair samples. 3 Basic Patterns of Cuticle

Cuticle Structure: Coronal Objective: SWBAT identify forensic evidence found in hair samples. Cuticle Structure: Coronal Scales stacked like paper cups (draw a pic in notes) Non human…. Ex. Bat Hair

Cuticle Structure: Spinous Objective: SWBAT identify forensic evidence found in hair samples. Cuticle Structure: Spinous Scales shaped like petals (draw a pic in notes) Non human…. Ex. Rabbit Hair

Cuticle Structure: Imbricate Objective: SWBAT identify forensic evidence found in hair samples. Cuticle Structure: Imbricate Scales flattened and close together (draw a pic in notes) Human hair has imbricate structure

Objective: SWBAT identify forensic evidence found in hair samples. Complete Activity: observing the cuticle Closure: What class evidence is found when observing hair? (use notes form yesterday) Need microscope, slides, and clear nailpolish

Objective: SWBAT identify forensic evidence found in hair samples in a real life crime story. Read the case study of Wayne Williams and hand in the questions and reading.

Hair structure

Objective: SWBAT identify forensic evidence found in hair samples. Medulla 3 types in Humans: Continuous Interrupted Fragmented/Absent

Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Continuous Formed as a solid center line

Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Interrupted Medulla is seen as individual cells or fragments in repeating intervals

Medulla: Fragmented/ Absent Objective: SWBAT identify forensic evidence found in hair samples. Medulla: Fragmented/ Absent Fragmented: few parts visible Absent: no medulla visible

Animal Vs. Human

Objective: SWBAT identify forensic evidence found in hair samples. The medullary Index is the ratio of diameter of medulla to the overall diameter of the hair Medullary index: Humans < 1/3 Animal > 1/2

Objective: SWBAT identify forensic evidence found in hair samples. Complete activity: observing the medulla Closure: What is the medullary index? materials

Naturally Shed Hair: rounded Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Naturally Shed Hair: rounded

Forcible Removal of Hair: bent or pointed Objective: SWBAT identify forensic evidence found in hair samples. Forcible Removal of Hair: bent or pointed Exhibits stretching and damage to root area and may have tissue attached

Burned Hair: black and bent Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Burned Hair: black and bent

Toxicology

Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Toxicology

Hair grows approximately 0.5 inches (1.3cm) per month. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Hair grows approximately 0.5 inches (1.3cm) per month. 1cm 2cm 3cm 4cm

Complete the toxicology worksheet and hand in. Objective: SWBAT determine the condition of hair and generate an idea on how it was lost. Complete the toxicology worksheet and hand in. 2. Closure: What is the most interesting thing you have learned about hair in this class so far?

Objective: SWBAT identify forensic evidence found in hair samples. 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?

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