Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair...
-
Upload
wilfred-goodwin -
Category
Documents
-
view
223 -
download
0
Transcript of Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair...
![Page 1: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/1.jpg)
Do Now:
1. Would hair be classified as individual evidence or class evidence? Why?
2. How can hair be helpful in a CSI?
Objective: SWBAT explain the various parts of a hair
![Page 2: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/2.jpg)
Announcements45 minutes- Grades catch up
![Page 3: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/3.jpg)
![Page 4: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/4.jpg)
Parts of the HairCuticle- tough, clear
outside covering for protection
Cortex- middle layer that provides strength and gives hair its color
Medulla- interior that provides flexibility
![Page 5: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/5.jpg)
Info: http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair Image: http://www.hairdressersus.com/micro/Image5b.jpg
Hair Structure
Cuticle
•Scales•Varies with species•Every human has an identical cuticle
![Page 6: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/6.jpg)
Cortex
• Texture• Color
• Protein Keratin – strength
Info: http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair Image: http://www.extrapersonality.com/hair.html
Hair Structure
![Page 7: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/7.jpg)
The CortexContains pigment that gives your hair it’s color
The absence of this pigment makes hair…..?
![Page 8: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/8.jpg)
MedullaThe medulla may vary in:
• Continuity - one continuous structure or broken into pieces
• Varies with species • Varies with different races
• It may also be absent in some species.
http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair
Hair Structure
http://www.bfro.net/images/whatis/figures/Fig.%203%20with%20caption.jpg
![Page 9: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/9.jpg)
The MedullaMost humans have no medulla (except Native Americans and
Asians, where medulla is usually continuous)
Types:
Interrupted
Fragmented
Continuous
Stacked
Absent—not present
![Page 10: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/10.jpg)
Recruitment Project1. Set up
2. Name and Case Number
3. Recruitment Grade (20) 15 pts
![Page 11: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/11.jpg)
Day 2Hair and the Crime
Scene
![Page 12: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/12.jpg)
Hair and Fibers at the Crime SceneInvestigators consider
these to be “trace evidence”
![Page 13: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/13.jpg)
What Happens When Hair or Fibers are Discovered?First Investigators
need to determine if it is human or animal
If it’s human, investigators need to narrow it down to a group of individuals who could be the suspects
![Page 14: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/14.jpg)
What We Can Learn From Hair SamplesWhether or not the source is animal or
humanRacial OriginLocation on the Source’s BodyWhether the hair has been chemically treatedColor Whether the hair was forcefully removed
![Page 15: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/15.jpg)
Hair as a Chemical IndicatorYour hair is capable of collecting materials
that come into your body via the blood stream and are delivered to your hair root and deposited in the cortex
Many drugs, vitamins, and poisons can be detected in just a few millimeters of hair
![Page 16: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/16.jpg)
Why do Fibers Have to Go Through So Many Tests?
So many of the same fibers are
found on a lot of textiles
![Page 17: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/17.jpg)
Many different natural fibers that come from plants and animals are used in the production of fabric.
http://www.fireflydiapers.com/articles/diaperarticle_naturalfibersabsorb.htm
Cotton fibers are the plant fibers most commonly used in textile materials
The animal fiber most frequently used in the production of textile materials is wool, and the most common wool fibers originate from sheep.
Natural Fibers
![Page 18: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/18.jpg)
Images: http://www.trashforteaching.org/phpstore/product_images/YarnWS.JPG http://www.fbi.gov/hq/lab/fsc/backissu/july2000/deedric3.htm#Fiber%20Evidence
http://www.jivepuppi.com/images/fiber_evidence.jpg
More than half of all fibers used in the production of textile materials are synthetic or man-made.
Nylon, rayon, and polyester are all examples of synthetic fibers.
Cross-section of a man-made fiber
Synthetic Fibers
Fibers under a microscope
![Page 19: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/19.jpg)
Fiber Transfer
Primary Transfer
Secondary Transfer
![Page 20: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/20.jpg)
Primary TransferAKA “direct
transfer”
Fiber transfers from a fabric source like a carpet, bed, or furniture at a crime scene
![Page 21: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/21.jpg)
Secondary TransferAlready transferred
fibers on the clothing of a suspect transfer to the clothing of a victim
![Page 22: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/22.jpg)
Does Fiber Transfer Always Occur?
NO!!
Certain types of fabrics do not shed well
![Page 23: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/23.jpg)
Fiber AnalysisVarious tests can be performed on fibers to
determine their properties.
![Page 24: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/24.jpg)
1. Burn TestFibers burn
differently, produce different odors when burned, and have different ash/residue appearances
![Page 25: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/25.jpg)
2. Thermal DecompositionWhen fibers are
gently heated, they often break down/ decompose into their simpler units
![Page 26: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/26.jpg)
3. Chemical TestsSolubility and
chemical decomposition properties are different based on fabrics are made of.
![Page 27: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/27.jpg)
4. Microscopic ExaminationGetting a closer look
at a fiber under a microscope to determine it’s properties
![Page 28: Do Now: 1. Would hair be classified as individual evidence or class evidence? Why? 2. How can hair be helpful in a CSI? Objective: SWBAT explain the various.](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697bf771a28abf838c81485/html5/thumbnails/28.jpg)
FIBER LABTake several pieces of tape and press it against
your shirt, sweater, or blouse.Rub it smooth and pull it off slowly and smooth it out
on your notebook paper. Repeat the procedure on your pants, skirt, or
whatever you’re wearing below your waist. Write in your lab book what fibers and hairs you think
you’ll.Label the source of each sample and look at it under
the compound microscope. Sketch and label what you see. Classify the hair and fibers (cotton, nylon, pet hair,
hair from head, etc). Did you predict the outcome correctly?What type of fabric is the best collector?What type is the worst?