Fingerprint Analysis Francis Galton n Established that no

Fingerprint Analysis

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

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

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

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

Dermal Papillae n n n Determine the structure of our _______ ridge characteristics The ridges allow for a _____ and firm grip slippage resistance to _____ If this layer is damaged scars form _____

Destruction of Fingerprints n n Can’t be done _____ n Skin grows back them more unique Scarring makes ________

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

Fingerprint Patterns Left Hand

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

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

Radial vs Ulnar Loops

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

Identify the Pattern

Identify each fingerprint pattern. Right Hand Left Hand

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

Directions 1 st – 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! 2 nd – 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. 3 rd – Continue this process to make a fingerprint of all ten fingers on the “My Prints” worksheet. 4 th –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.

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

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!

Ridge Characteristics A X E E L MP Crossover Core Bifurcation (fork) Ridge ending Scar Island Delta Pore http: //cnx. org/content/m 12574/latest/properties. jpg

Identify. . http: //www. dkfz. de/tbi/projects/bmcv/images/iu_it 246_04 s_fingerp rint 1. jpg

Identify. . .

One more time. .

Identify. . .

AFIS n n database Fingerprint _______ Matches prints World wide n _______

Developing Latent Prints n https: //www. youtube. co m/watch? v=tq. Fz. Vf. PRd 5 s