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Fingerprints

Fingerprints. bsapp.com. Fingerprints . Fingerprints result from friction skin ridges found on the palm side of the hand, fingers, and thumbs (also feet) Fingerprints are oil and Sweat that leave the imprint of these ridges. Principles of Fingerprints First Principle:.

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Fingerprints

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  1. Fingerprints bsapp.com

  2. Fingerprints • Fingerprints result from friction skin ridges found on the palm side of the hand, fingers, and thumbs (also feet) • Fingerprints are oil and Sweat that leave the imprint of these ridges

  3. Principles of FingerprintsFirst Principle: • A fingerprint is an individual characteristic and . . . . • No two fingers have yet been found to possess identical ridge characteristics bsapp.com

  4. Second Principle: • A fingerprint will remain unchanged during an individual's lifetime. bsapp.com

  5. John Dillinger bsapp.com

  6. Third Principle: • Fingerprints have general ridge patterns that permit them to be systematically classified. bsapp.com

  7. Vocabulary to review • Minutiae • AFIS

  8. Pattern area of a loop surrounded by two diverging ridges is known as type lines. The ridge point nearest the type-line divergence is known as a delta. A fingerprint delta resembles the silt formation that builds up as a river flows into the entrance of a lake or an ocean. The core, as the name suggests, is the approximate center of the pattern where ridges curve around or circle. DELTAS VS CORES

  9. Deltas & Cores bsapp.com

  10. Three Main Types of Prints • Loops • Whorls • Arches bsapp.com

  11. Loops • A loop must have one or more ridges that enter from one side of the print, re-curve, and exit from the same side • This results when one Delta & one Core are present bsapp.com

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  15. Whorls • One or more cores • At least two deltas bsapp.com bsapp.com

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  19. Arches • An arch is formed by ridges entering from one side of the print, rising slightly and exiting on the opposite side. • No Deltas & No Cores bsapp.com

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  23. AFIS/IAFIS • Automated Fingerprint Identification System • FP are scanned, converted to a digital file • Stored at FBI • Computer scanning is millions of times faster than comparing characteristics by humans

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