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Fingerprinting is the method of identification using the impression made by the minute ridge formations or patterns found on the underside of each finger in humans¸ It is also called dactyloscopy¸ No two persons have exactly the same arrangement of ridge patterns including identical twins‚ and the patterns remain unchanged through life¸ There are eight general types of fingerprints that are defined in the Henry system still practiced by the current FBI¸ There are the plain arch‚ tented arch‚ radial loop‚ ulnar loop‚ plain whorl‚ central pocket loop‚ double loop‚ and accidental¸ Although only eight patterns are possible‚ the arrangements and distances are accounted for in each of these patterns which theoretically provides an indefinite amount of unique fingerprint patterns¸