1. Fingerprint Images
Forensics
Mr. Foster

2. LOOP
WHORL
ARCH

3. Calculating Primary Henry Classification
Each Finger is given a point value

4. Calculate your Primary Henry Classification
Assign the number of points for each finger that has a whorl and substitute into the equation:
right right left left left
index ring thumb middle little + 1
right right right left left
thumb middle little index ring + 1 =
Only add the number if you have a whorl on the finger!

5. Frequency of Fingerprint Patterns Secondary Henry Classification
Loops
65%
Whorls
30%
Arches 5%

6. There are more than 3 pattern classifications.
Right hand
Ulnar
Right hand
Radial

7. thumb side
Pinky side

8. Frequency of Fingerprint Patterns Secondary Henry Classification
Loops
65%
Whorls
30%
Arches 5%
Ulnar
Radial
Plain
Other
Tented
60%
20%
10% 4% 1%
More specific %’s for categories of each pattern type

9. Fingerprint Lab and Probability
Secondary Henry Classification
2. What would happen to your probabilities if you incorporated the more specific %’s?

10. Minutiae
Or Triradius

12. Activity #2
Identify 1-15

13. Activity #3- look at the handout and identify prints that came from the same finger.

14. KEY

15. Key to Fingerprint Matching Worksheet
A = G = S This one is interesting; there are three separate impressions of the same finger with some very unique features.
B = no match
C = no match
D = no match
E = T
F = J
H = R
I = no match
K = O
L = no match
M = P
N = Q