1. Fingerprint Analysis

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

3. Fingerprint Principles
1. Are ____________ characteristics.
2. Remain __________ for life.
Change by scarring
3. Ridge patterns that allows them to be _________
individual
unchanged
identified

4. Types of Prints Latent Prints
Fingerprint made by the deposit of _____ and/or _________
_________ easily see this type of print.
oil
perspiration
Can’t

5. Types of Prints Visible Prints
Made when the finger deposits ____________ onto a surface
Ex. ____________
Plastic Prints
Fingerprint impressed in a ______________
visible material
Ink, blood
soft surface

6. Dermal Papillae Determine the structure of our ______________
The ridges allow for a __________ and resistance to _________
If this layer is damaged __________
ridge characteristics
firm grip
slippage
It is totally impossible to oliterate all of the ridge characteritics on the hand. The presence of permanent scars provides new characteristics for identification
scars form

7. Destruction of Fingerprints
__________
Skin grows back
Scarring makes ________________
Can’t be done
them more unique

8. John Dillinger Tried to get rid of his own fingerprints with acid
But it did not work
Tried to get rid of them

9. Fingerprint Patterns
Left Hand

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

11. 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

12. Radial vs Ulnar Loops

13. 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

14. Identify the Pattern

15. Identify the Pattern

16. Identify the Pattern

17. 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

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

19. 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.

20. Fingerprint Identification
Matching of prints
Ridge characteristics on ______________ prints match
No set standard for number of _______
two different
matches

21. 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!

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

23. Identify

24. Identify

25. One more time

26. Identify

27. Identify

28. Identify

29. Identify

30. AFIS Fingerprint ______________ database Matches prints ______________
World wide

31. Developing Latent Prints