1. Fingerprints

2. Fingerprints in Court It is scientific evidence because…
Human friction ridges are unique and permanent
No two fingerprints have the same identical ridge characteristics Maybe.

3. 3 Types of Fingerprints Latent prints – most often what we think of…
Transfer of body perspiration or oils; present on the surface of an object.
Plastic prints
Fingerprint impressed on a soft surface (putty, soap, or dust)
3. Visible prints
Made with visible material (ink, dirt, or blood on a surface)

4. (mi-NOO-shee-uh) Individual fingerprint determined by:
Ridge characteristics (minutiae)
Location
Number of specific types of minutiae
Point by point comparison

5. Minutiae (mi-NOO-shee-uh) Points
Ending Ridge * Double Fork
Fork * Delta
Short Ridge * Triple Fork
Dot
Bridge
Hook
Eye

8. 3 different classes of fingerprints
Loop (60-65% of the pop.)
Define: ridge lines enter from one side of the pattern and curve around to exit from the same side of the pattern
Whorl (30- 35% of the pop.)
Ridge patterns that are generally rounded or circular in shape and have two deltas
Arch (~ 5 % of the pop.)
Ridge lines that enter the print from one side and flow out the other side.

10. Loops Arch Plain Loop Central Pocket Loop Double Pocket Loop
Plain Arch
Tented Arch

11. Methods of Detecting Fingerprints
Fingerprint powder
Then tape lift
Super Glue Fuming: super glue is heated turned to a gas… gas sticks to oils / ridgelines… print dries white
Then tape lift or photograph

12. Methods of Detecting Fingerprints
UV light – prints appear orange
Then photograph
… uses a POLI - LIGHT

13. Polilights

14. Quiz
Fingerprints change throughout the course of your life T F

15. MATCHING: (A – Latent Prints) (B – Plastic Prints) (C – Visible Prints)
2. Made with visible material (ink, dirt, or blood on a surface)
3. Transfer of body perspiration or oils; present on the surface of an object.
4. Fingerprint impressed on a soft surface (putty, soap, or dust)

16. 5. What is the word for individual ridge characteristics
5. What is the word for individual ridge characteristics? Print experts look for about 9 of these for a match.

18. 10-12. Write out what L – A – W stands for.

19. 13. List the tools needed to “lift” or “dust” for prints
13. List the tools needed to “lift” or “dust” for prints. In other words, what do you find in a finger print kit?