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Fingerprinting

Fingerprinting. What is a Fingerprint?. A skin pattern created by the papillary ridges in the dermal layer of skin. These ridges cause the epidermis to change shape and form a “print”. 1 http://www.humanthermodynamics.com/jht/fingerprints.html. How do fingerprints develop?.

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Fingerprinting

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  1. Fingerprinting

  2. What is a Fingerprint? • A skin pattern created by the papillary ridges in the dermal layer of skin • These ridges cause the epidermis to change shape and form a “print” 1http://www.humanthermodynamics.com/jht/fingerprints.html

  3. How do fingerprints develop? • During gestation (fetal development), stresses are created from folding of developing tissues • These stresses are found at skin boundaries like the fingertips • The stress folds develop a fingerprint when the fetus is 16 weeks 2http://www.livescience.com/health/041102_fingerprint_creation.html 3http://www.medicinenet.com/fetal_development_pictures_slideshow/article.htm

  4. Fingerprint Types 4 http://imaclanni.com/wordpress/category/lesson-plans/

  5. Always Unique • Fingerprints are unique to every individual, even identical twins • Because they are never alike, they are now used for criminal investigations • The FBI has the largest database of fingerprints containing 250 million prints of criminals, government employees, teachers, etc. 5http://www.hcso.tampa.fl.us/SOD/ffingerprintid.htm

  6. At a Crime Scene • When oil from the body is mixed with other body sweat and dirt, a fingerprint will be left behind on an object that was touched. • Fingerprints found at crime scenes can be visible to the naked eye or “latent” and require UV light or chemical powders to be seen 6http://www.drakeinvestigations.com/ForensicScience/tabid/1511/language/en-US/Default.aspx

  7. Can You Tell the Difference? Fingerprint Memory Game

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