Exercise 2 Fingerprint Rolling Technique and Minutiae Identification In this exercise, you will use proper fingerprint rolling technique to produce a set of either a volunteer’s fingerprints or, if a 1

Exercise 2 

Fingerprint Rolling Technique and Minutiae Identification

In this exercise, you will use proper fingerprint rolling technique to produce a set of either a volunteer’s fingerprints or, if a volunteer is not available, your own fingerprints. You will then analyze the minutiae of the collected fingerprints.

Procedure

  1. Fill out the subject’s name, the date, and have the subject sign in the appropriate sections at the top of the FBI card.

Note: You may leave the remaining sections at the top of the FBI card blank.

  1. Place the ink pad strip on the white paper and peel it apart into two pieces, exposing the ink.
  2. Have the subject providing the fingerprints wash their hands with soap and water and thoroughly dry them with a clean towel.
  3. Have the subject extend the right index finger and tuck all other fingers into the palm of the hand, as if pointing at something.
  4. Use a free hand to press and roll the right index finger from left to right on the ink strip so that the finger is evenly coated in ink.

Note: The ink should cover the terminal digit of the finger to the edges of the fingernail. Pressing the finger too hard may fill the grooves of the fingerprint with ink. This will prevent you from obtaining a clear fingerprint to analyze.

  1. Use your hands to position the right index finger over the blank sheet of paper to practice your rolling technique.
  2. Place the left edge of the finger so that the edge of the nail is touching the paper.

Note: If you are fingerprinting an individual, you should stand to their left. When rolling the fingers, roll them away from your body. 

  1. Roll the finger from left to right, and then off the paper. See Figure 5.

  2020 Science Interactive. All rights reserved.Figure 5. 

The finger is rolled from one side of the nail to the other.

Note: A quality fingerprint should clearly contain the ridge skin from nail to nail. This creates a rectangular fingerprint. 

  1. Practice your rolling technique until you are able to produce a quality fingerprint.
  2. Use your hands to position the right forefinger over box 2 on the fingerprint card, labeled “R. INDEX” and roll the right finger in the appropriate area.
  3. Repeat step 5-10 for the right middle finger, right ring finger, and right little finger in their allotted spaces.
  4. Have the subject extend the right thumb and tuck all other fingers into the palm of the hand, as if giving a thumbs-up.
  5. Use a free hand to press and roll the right thumb from left to right on the ink pad so that the thumb is evenly coated in ink.
  6. Roll the right thumb in box 1, labeled “R. THUMB,” from right to left, toward your body.
  7. Wash the ink from the hands with soap and water.
  8. Repeat steps 5-15 for the left hand.
  9. Repeat step 5 to apply ink to the right thumb.
  10. Press the right thumb print flat in the box on the bottom row of the fingerprint card labeled “R. THUMB.”
  11. Repeat step 5 to apply ink to each of the four right-hand fingers.
  12. Press the four right fingers flat onto the box on the bottom row of the fingerprint card labeled “RIGHT FOUR FINGERS TAKEN SIMULTANEOUSLY.”
  13. Wash the ink from the hands with soap and water.
  14. Repeat steps 17-21 with the left hand.
  15. Take a picture of your completed fingerprint card.
  16. Upload this image into Photo 3.
  17. Use a hand lens to examine the right thumbprint on your fingerprint card.
  18. Identify the basic pattern (arch, whorl, or loop) of the right thumb.
  19. Record the patterns in Data Table 1.
  20. Identify the minutiae characteristics of the right thumb using Table 1 as a guide.
  21. Record the minutiae in Data Table 1.

  2020 Science Interactive. All rights reserved.Table 1. 

Common ridge minutiae.

  1. Repeat steps 25-29 for the remaining prints listed in Data Table 1.

Clean Up

  • Return the reusable items to your lab kit and dispose of all other items in the trash.

Exercise 2 – QuestionsQuestion 11. Were the fingerprints for each finger different or the same?

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Question 22. What is the difference between the individual fingerprints and when all four fingerprints were taken at the same time?

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