1. Fingerprint Pattern Interpretation

2. Created as a supplement to Chapter 8 of Fingerprint Identification All rights reserved Copyright © 2004 William Leo

3. Basic Fingerprint Patterns Loop – 60-65% Whorl – 30-35% Arch – 5%

4. LOOPS TWO TYPES –ULNAR –RADIAL ALL LOOPS HAVE A DELTA, A CORE, AND A RIDGE COUNT ACROSS A LOOPING RIDGE

5. DELTA The point on a ridge at or in front of the point where the “type lines” separate or diverge.

6. Type Lines

7. Loop Ridge Counting

8. Ulnar Loop on right hand or right slope loop

9. Radial Loop on right hand or left slope loop

10. Whorls All whorls have at least two deltas and a recurve in front of each delta. Four types of whorls –Plain Whorl –Central Pocket Loop Whorl –Double Loop Whorl –Accidental Whorl

11. Plain Whorl

12. Central Pocket Loop Whorl

13. Double Loop Whorl

14. Accidental Whorl

15. Whorl Tracing Starting from the left delta drop one ridge and follow it to the right delta. If a ridge ends drop to next ridge and continue. Stop at the closest point to the right delta. Inner Tracing –Three or more ridges inside the right delta Meeting Tracing –Meeting the right delta or two ridges either side of the delta. Outer Tracing –Three or more ridges outside the right delta

16. Inner Whorl Tracing

17. Meet Whorl Tracing

18. Outer Whorl Tracing

19. Arches Two Types: –Plain Arch –Tented Arch

20. Plain Arch

21. Tented Arch