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 the Pattern
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. . .
Identify. . .
Identify. . .
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
- Slides: 31