1. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Warm-Up September 25, 2014 How are natural and synthetic fibers distinguished?

2. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Objective SWBAT analyze hair and fiber evidence to solve a crime.

3. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Agenda 1.Unit 2 Exam Tracking 2.Jeffrey MacDonald Case Study 3.Hair & Fiber Analysis Lab 4.Atlanta Child Murders Documentary 5.Exit Slip

4. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Unit 2 Exam Tracking Forensic Anthropology #1-10, TOTAL = 18 points Forensic Pathology #11-15, TOTAL = 13 points Forensic Entomology #16-23, TOTAL = 17 points

5. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Jeffrey MacDonald Case Study 1.How was MacDonald’s family murdered? 2.What did MacDonald say happened? 3.What happened at the crime scene according to Morris? 4.What did Stockley say happened on the night of the murders? 5.What happened when Stockly testified and why? 6. What testing was not available at the time of the murder? 7.What evidence was at the crime scene that did not match anyone in the MacDonald family?

6. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com

7. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Hair and Fiber Trace Evidence The two most common types of trace evidence are hair and fibers. The type, condition, and number of hairs found at a scene all contribute to their value in an investigation.

8. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Structure of Hair The root sheath is the base from which the hair shaft grows. DNA can be obtained from the hair root. Hair shafts contain 3 layers: –medulla (inner) –cortex (middle) –cuticle (outer)

9. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Determining Hair Location Scalp hairs are longer with a moderate shaft diameter and broken up medulla. Pubic hairs are more coarse and wiry. They have broad, continuous medullas throughout.

10. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Determining Hair Location Scalp hairs show characteristics from grooming: –coloring –bleaching –split or cut ends Human hair grows at about ½ inch per month, giving an investigator the ability to measure the duration between a crime and an event such as coloring the hair.

11. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Fibers Fibers can be from natural or synthetic sources. Fibers may support or refute statements from both witnesses and suspects. Fibers found on the accused present a compelling argument that the individual was at the crime scene.

12. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Matching Fibers Finding multiple types of fibers on the suspect and scene increases the likelihood that this did not occur by chance alone. Cross-transfer of fibers (the suspect both leaves and takes fibers from the scene) provides more compelling evidence in a case.

13. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Hair & Fiber Analysis Lab Some changes made… –I have completed the “Removing Fibers from Collection Tape” –In “Preparing the Slide” – only do one piece of evidence

14. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Homework Read Chapter 14, pages 472-479 for Friday

15. Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. www.CrosscuttingConcepts.com Exit Slip September 25, 2014 Go to m.socrative.com or the socrative app. Room # is 417101 QUESTION: What characteristics were you able to see that allow you to distinguish between hairs and fibers?