1. Fingerprint Analysis

2. Fingerprints

3. Francis Galton Established that no two prints were _____________
Noticed 3 patterns: 1. 2. 3.
identical
Loops
Arches
Whorls

4. Which animals have fingerprints?
Fingerprint Patterns
Are made up of a series of ______________ and _____________
What makes them unique?
The ridge pattern and minutiae points
ridges
valleys
Minutia points = (where the structure changes)
Which animals have fingerprints?
Primates and Koalas

5. Fingerprint Principles
Fingerprints are individual characteristics.
Fingerprint patter will remain unchanged for life.
Fingerprints have a general ridge patterns that allows them to be identified.

6. What is the study of fingerprint called?
Some Questions
Which print pattern is the most common?
Which print pattern is the 2nd most common?
Which print pattern is the least common?
What is the study of fingerprint called?
Dactyloscopy, police investigators are experts in collecting “dactylograms”, otherwise known as fingerprints.

7. Fingerprint Patterns
Left Hand

8. Arches
opposite sides
Ridges enter and leave from __________________ sides.
Tented Arches
Spike or “tent”
Plain Arch

9. Radial and Ulnar Loops delta the same side Radial Loop VS
Have one ______
Enter and leave the print from______________
delta
the same side
Delta
Radial Loop
opens toward the radius/thumb
Ulnar Loop
Opens toward the ulna/pinkie VS

10. Radial vs Ulnar Loops

11. Whorls deltas Have at least two ______ Plain Whorl
Central Pocket Whorl
Double Loop Whorl
Accidental Whorl
Delta
“Ying yang”
Does not fall under
other patterns

12. Identify the Pattern

13. Identify the Pattern

14. Identify the Pattern

15. Identify each fingerprint pattern.? A B
Right Hand
Left Hand
Answer Key: A - Plain Whorl, B – Double Loop Whorl, C – Radial Loop, D – Tented Arch, E – Plain Arch C
Right Hand E D
Right Hand
Left Hand

16. It’s time to make some prints!
Avoid Partial Prints
GOOD PRINT Get as much of the top part of your finger as possible!

17. Directions
1st – Roll the “pad” portion of your thumb over the ink pad from the left side of your thumb to the right. You do not have to push down really hard!
2nd – Roll the “pad” portion of your thumb from the left side of your thumb to the right in the correct box on your paper to make a thumbprint.
3rd – Continue this process to make a fingerprint of all ten fingers on the “My Prints” worksheet.
4th –Use your notes and a magnifying lens to help you figure out what type of pattern is found in each of your fingerprints. Label each one with the pattern’s name.

18. Fingerprint Identification
When do prints match?
When ridge characteristics on two different prints match
No set standard for number of _______
UK requires 16
Australia requires 12
matches

19. Ridge Characteristics
Use these characteristics as points of identification when comparing fingerprint samples. The more points you can find in common, the better the match!

20. Ridge Characteristics
Crossover
Core
Bifurcation (fork)
Ridge ending
Island
Delta
Pore
Scar
EXAMPLE

21. Identify

22. Identify

23. One more time

24. Identify

25. Identify

26. Identify

27. Identify

28. Can you destroy your fingerprints?
________
What does scarring do to your fingerprints?

29. What is AFIS?