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Forensics Q2 Week 4Impressions and Fibers Slides
Impressions and Fibers Slides
Topics Covered in This Unit:
Topics Covered in This Unit:
- Shoe impressions
- Tire tracks
- Tool marks
- Bite marks
- Hair/fur
- Synthetic fiber
- Bullet/casings (ballistics)
What types of impressions and fibers are used in forensic science?
What types of impressions and fibers are used in forensic science?
How useful are each of these types?
How useful are each of these types?
In this unit, the work and assignments help answer these questions. The assessment will be a project, similar to the crime scene processing unit; A project evaluating the usefulness of these types of evidence.
In this unit, the work and assignments help answer these questions. The assessment will be a project, similar to the crime scene processing unit; A project evaluating the usefulness of these types of evidence.
Tuesday, 5/29
Tuesday, 5/29
How useful are hairs and fibers as evidence?
- Hair presentation
- Hair lab
- Finish ballistics assignment (Last Thursday)
- 2 conclusions on website:
- How useful are the following types of evidence?
- Hair
- Natural & Synthetic Fibers
- How useful are the following types of evidence?
Impressions & Fibers Assessment
Impressions & Fibers Assessment
- Begins tomorrow
- Is a presentation that ranks the various types of evidence
- Will be the LAST thing for seniors!
Thursday, 5/24
Thursday, 5/24
Question: How useful are bullets as evidence? What can be learned about a crime from the ballistic evidence?
Question: How useful are bullets as evidence? What can be learned about a crime from the ballistic evidence?
Ballistics Assignment: Due Tuesday, 5/29
Ballistics Assignment: Due Tuesday, 5/29
- Open the Ballistics Presentation .pdf
- Create a text box titled Ballistics on your Impressions & Fibers page
- Answer the questions below in that text box
- What is forensic ballistics?
- What are the three categories of forensic ballistics? What does each category mean?
- Where do striations on a bullet come from? Why are they useful as evidence?
- What does a bullet's caliber measure?
- Besides striations, what impression evidence can be obtained when a bullet is fired?
- Why are shotgun shells more difficult to use as evidence?
Tuesday, 5/22
Tuesday, 5/22
Warm Up:
- Who has a tire track quiz to take?
Lesson:
- No Bones About It (Directions on a separate subpage)
Monday, 5/21
Monday, 5/21
Goal: Evaluate the usefulness of tire track impressions as evidence
Lesson: Complete tire track quiz (scans on your site!)
Thursday, 5/17
Thursday, 5/17
Goal: Evaluate the usefulness of tire track impressions as evidence
Warm up: On your website, write a paragraph conclusion about shoe prints.
- What are pros/cons/limitations
- Situations where shoe prints might be of particular use
Lesson:
Tire track day!
Tire track day!
- Make a tire track matching quiz on your website. Your classmates can take these quizzes and evaluate the usefulness of a tire track impression.
- Photograph 5 different tire tread patterns
- Make crayon impressions of those 5 tires. Write your initials/name somewhere on the paper
- Practice, get good quality shots!
- Upload the photos onto your website
- Mr. Miller will scan your impressions and send them to you
- Put the impressions on your website
- Format the site, give instructions for the viewer.
Impressions and Fibers Assignments:
- Shoe impression
- Matching Footprints (handout)
- Jacob Wetterling article (website)
Wednesday, 5/16
Wednesday, 5/16
- Footwear impression assignment (Due Friday)
- Questionable Shoe Prints & Tire Tracks (Due Friday)
- Update notes on your website- evaluate shoe prints as evidence. Make note on how valuable you consider shoe prints to be; pros/cons, limitations, etc.
They can rule out a suspect, but shoe prints and tire tracks in the dirt lack solid standards for use as forensic evidence.
They can rule out a suspect, but shoe prints and tire tracks in the dirt lack solid standards for use as forensic evidence.
Read the following article: http://www.apmreports.org/story/2016/09/27/questionable-science-tire-track-shoe-print
Answer the following questions in complete sentences: (Copy/paste to your impressions page)
- What are some of the problems detectives faced when trying to identify Jacob Wetterling's kidnapper? Give at least three reasons.
- "[Tire track/shoe impression identification] is completely subjective." says Mary Moriarty, chief public defender for Hennepin County. What does she mean by this?
- Explain the prominent blunder that took place in 2004.
- What does 'consistent with' mean to a detective?
- Recently, tire tracks and shoe impressions have 'fallen out of favor' with forensic detectives. What is given as a major reason for this? Do you agree? Why/why not?
- "The educational background of forensics scientists who examine shoeprints and tire track impressions runs the gamut from a high school diploma to scientists with Ph.D.s. Identifications are largely subjective and are based on the examiner's experience." -2009 NAS Report
- Based on what you've read, how do you think these types of impressions should be used? What changes, if any, should be made for impressions to be more useful as evidence? Provide evidence for your answer.
Tuesday, 5/15
Tuesday, 5/15
- Complete your shoe impression analysis (yesterday)
- Footwear impression assignment
- (if time) Questionable Shoe Prints & Tire Tracks
Monday, 5/16 Topics Covered in This Unit:
Monday, 5/16 Topics Covered in This Unit:
- Shoe impressions
- Tire tracks
- Tool marks
- Bite marks
- Hair/fur
- Synthetic fiber
- Bullet/casings (ballistics)
Warm up: On your new Impressions & Fibers webpage: rank these topics in order of MOST USEFUL --> LEAST USEFUL
- Give a reasoning for each
Lesson: Take your shoe prints
- Obtain the following: 1 crayon, 2 sheets of paper, your shoed self
- Gently unwrap (half) the crayon.
- Use the side of the crayon to take your shoe impression (a crayon rubbing).
- Complete this for both shoes, one on each paper.
- Write your name on the back of both impressions.
- Give the right foot impression to Mr. Miller
- On the left foot:
- label 3 measurements.
- circle and describe 6+ unique/distinguishing features
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