FINGERPRINTS

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This session provides participants with an understanding of fingerprints and how they’re analyzed and compared in the forensic laboratory.

Category

  • Exploring: Law Enforcement
  • Exploring: Science
  • S. Department of Education: STEM
  • S. Department of Education: Law, Public Safety, Corrections & Security

Objectives

  • Describe what friction ridge skin is and where it’s found.
  • Describe the two premises that fingerprint identification is based on.
  • Explain the concept of an exemplar as it pertains to fingerprints.
  • Create exemplars of all ten of your fingers.
  • Describe each portion of a tenprint card and explain its purpose.
  • Identify the basic pattern types that are employed in fingerprint classification.
  • List the fingerprint pattern type frequencies.
  • Classify the pattern types on each of your own ten fingers.
  • Describe the information provided by fingerprints.
  • Distinguish between the 3 primary ridge features that are used in identification.
  • Identify and label ridge features using the correct nomenclature.
  • Summarize the three conclusions that can be reached in a fingerprint comparison.
  • Compare and identify a questioned fingerprint to a known fingerprint.

Supplies

  • (1) computer with internet access
  • (1) fingerprint ink pad (if a fingerprint ink pad is unavailable, a bank ink pad will do)
  • (1) hand lens/magnifying glass
  • (1) red pencil
  • (1) ruler
  • (1) roll of packing
  • (1) pair of scissors
  • (2) alcohol

 

The following PDFs can be found by clicking the activity outline link at the bottom of this page:

  • PDF document titled Tenprint Card
  • PDF document titled Fingerprint Classification Overview
  • PDF document titled Fingerprint Classification Exercise
  • PDF document titled Fingerprint Individualization Overview
  • PDF document titled Fingerprint Individualization Exercises Instructions
  • PDF document titled Fingerprint Individualization Exercises
  • PDF document titled Fingerprint Individualization Exercises Answer key

Advisor Note

Activity 1

ACTIVITY 1

  • Review the PDF document titled Fingerprint Classification Overview with participants.
  • Review the PDF document titled Fingerprint Classification Exercise with participants.
  • Have participants complete the exercise as described in the instructions.
  • Review the results with the participants upon completion.

Activity 2

ACTIVITY 2

  • Review the PDF document titled Fingerprint Individualization Overview with participants.
  • Review the PDF document titled Fingerprint Individualization Exercises Instructions with participants.
  • Have participants complete the exercises one at a time in the order presented.
    Ridge Feature Recognition
    Ridge Counting
    Charted Enlargement (Loop)
    Charted Enlargement (Whorl)
    Charted Enlargement (Arch)
  • IMPORTANT! Using the PDF document titled Fingerprint Individualization Exercises Answer Key, advisors should review each exercise with the participants prior to allowing them to proceed to the next exercise

Activity 3

ACTIVITY 3

  • Using a computer and the internet, look up 5 criminal cases that involve fingerprint evidence.
  • Write a short summary of how fingerprints contributed to the resolution of each case.

Activity 4

ACTIVITY 4

  • Using a computer and the internet, look up universities and colleges that have accredited forensic science programs that have fingerprints as part of their curriculum.
  • Contact the colleges and universities and ask them for more information on their forensic science programs.

Activity 5

EXTENSION

  • Arrange for a visit to a local, county, or state crime laboratory with an emphasis on the latent print section.
  • Reach out to a crime laboratory and ask them to send a latent print examiner to talk to participants.
  • Attend a trial where latent fingerprint evidence is being presented.
  • Contact a local CSI unit and request a guest speaker.
  • Contact a local police station and ask if participants can visit the police station and get an in-person demonstration of how fingerprints are recorded.

Advisor Note

Reflection

Focusing Questions

Analysis Questions

Generalization Questions

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