1. Fingerprints
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3. Principles of Fingerprints
First Principle: A fingerprint is an individual characteristic; no two fingers have yet been found to posses identical ridge characteristics.
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4. Principles of Fingerprints
Second Principle: A fingerprint will remain unchanged during an individual's lifetime.
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5. John Dillinger
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6. Principles of Fingerprints
Third Principle: Fingerprints have general ridge patterns that permit them to be systematically classified.
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7. Three Main Types of Prints
Loops
Whorls
Arches
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8. Deltas & Cores
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9. 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
One Delta & One Core
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13. Whorls
One or more cores
At least two deltas
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17. 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
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