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Do Now: Update your exit ticket tracker!

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Do Now: Update your exit ticket tracker! - PowerPoint PPT Presentation


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Objectives:. Students will be able to compare and perform fingerprint detection techniques. SWBAT describe the historical and current methods for fingerprint matching. Do Now: Update your exit ticket tracker!

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Presentation Transcript
slide1

Objectives:

  • Students will be able to compare and perform fingerprint detection techniques.
  • SWBAT describe the historical and current methods for fingerprint matching.

Do Now:

Update your exit ticket tracker!

1.Explain the history of the fingerprint system so far. (Bertillonage system to Henry classification system)

2. What is the difference between a latent, plastic and patent print?

3. Why might a detective need to use a power test on a crime scene?

announcements
Announcements
  • Exit ticket trackers up-to-date
  • Quiz on Tuesday
  • Homework due on Tuesday
exit ticket
Exit Ticket
  • Raised portions on your hands that allow for gripping:
      • Fingerprint b. Whorls c. Friction Ridges
      • Define basal layer.

3. If 65% of fingerprints have loops, how are fingerprints considered individual evidence?

review
Review

Finishing the unit: Why are we learning about fingerprints? What does that have to do with Forensic Science?

Fingerprints

Patterns

Minutiae

Types of fingerprints

History

erase your fingerprints
Erase your fingerprints
  • Bricklayers and Secretaries- tends to wear down ridges
  • work with lime [calcium oxide] – base. dissolves the top layers of the skin. The fingerprints tend to grow back over time.
slide8

Why would the Henry Classification System fail?

But FIRST

CFU:

The Henry Classification System uses:

a. The amount of whorls on your index fingers to calculate a number

b. The presence of whorls on all ten fingers to calculate a number

Turn and Talk: Why would the Henry Classification System fail?

slide9
AFIS

Automated Fingerprint Identification System

Modified Henry Classification system System

A better method of storing, retrieving, and matching fingerprints using 10 print system

Digitally encodes fingerprints

slide11

SWBAT describe, compare, and perform fingerprint detection techniques. SWBAT describe the historical and current methods for fingerprint matching

Objective Check:

slide12
CFU:
  • T/F: AFIS is similar to the Bertillonage system, in which both systems uses measurements of key features (i.e. height, diameter of head)
fingerprint detection techniques
Fingerprint Detection Techniques

Powder Testing– powder attaches to oils

Iodine- attach to oils from fingers

Ninhydrin - reacts with amino acids (proteins)

Silver nitrate- reacts with salt

Objective Check:

Students will be able to describe, compare, and perform fingerprint detection techniques.

slide14
Lab
  • 1. Partner 1/Partner 2 …..Partner 3
  • 2. Start with Silver Nitrate (no spills)
  • 3. Plastic Print- turn in
  • 4. Dark powder- chocolate allergy??...baby oil
  • 5. Post lab questions- 2 hand writing
objective check
Objective Check!
  • Students will be able to describe, compare, and perform fingerprint detection techniques.
exit ticket1
Exit Ticket
  • 1. Visible prints left by a finger that has touched colored material such as blood or paint is called

A. Latent B. Patent C. Plastic D. Paint

  • 2. The chemicals used to develop latent prints reacts with the _______ left by your fingers. (may be more than one answer)
  • 3. Describe the history of the fingerprint system.
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