1. How can We Classify Fingerprints? TBT: Drug Identification Cold Call
May 8, 2014
How can We Classify Fingerprints?
TBT: Drug Identification Cold Call

6. Agenda Drug Analysis Lab Review Introduction to fingerprints
Fingerprinting
Fingerprint analysis
Fingerprint characteristics

7. Drug Analysis What were the reactions you saw in the wells?
What ingredient contained the aspirin?
Follow your procedures!!!

8. What is a fingerprint? Unique patterns on our fingers Individual
Circumstantial

9. What is a fingerprint? Markings left on objects we touch.
Due to secretions (water, oil, salt) from sweat glands in our fingertips.

10. Fingerprinting By the end of this activity, you will be able to:
Identify your fingerprints
Compare your fingerprints to those of your classmates

11. Fingerprints You will each receive: Piece of clear tape Pencil
Notecard

12. Fingerprinting procedure
Rub your pencil back and forth on the lined side of your notecard, creating a small patch of graphite, about 2 x 3 inches.
Roll your right index finger from side to side across the graphite patch. Your finger should be coated with graphite from fingernail edge to fingernail edge, and from joint to tip.
Place the tape on your finger so that it goes from fingernail edge to edge.
Gently peel off the tape.
Press the tape into your notebook.
Examine your print using a magnifying glass. Try to find any unique characteristics or patterns.

13. Fingerprint Characteristics

14. Loops
Enter from right or left, and exit that same side

15. Arches
Enter from one side, rise in the center, and leave from the other side.

16. Whorls
Circular ridges, looks like a bull’s-eye

17. Fingerprint ID Take out your Fingerprint ID Sheet.
What pattern did you have on your right index finger?
We will now calculate the class’ average fingerprint pattern.

18. Class Average Calculation
# of Loops / Total # of students
# of Whorls / Total # of students
# of Arches/ Total # of students

19. Population Percentages
The following are percentages of the total population:
Loops: 65%
Whorls: 30%
Arches: 5%
How do our results compare?

20. Fingerprint ID How could this activity be improved? Accuracy
Clarity of print

21. Fingerprint Principles
A fingerprint is an individual characteristic; no two people have the exact same fingerprint
A fingerprint pattern will remain unchanged for life
Fingerprints have ridge patterns