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Forensics Finger Prints


Submitted By hmcoby
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The three fingerprint patterns are loop, whorl, and arch. The ridges in a loop pattern move in one side, recurve, touch or pass through an imaginary line drawn from the delta to the core, then exit the pattern on the same side from which it first entered. The delta of a fingerprint is the point on a ridge at or in front of and nearest the center of the median of the ridge. Anatomically, it is located as a triangular area where the ridges move outward in three swift directions.
Whorl patterns consist of a series of almost concentric circles, contain two deltas, and account for roughly 25 percent of fingerprints. The four types of whorl patterns are plain, central pocket loop, double loop, and accidental loop. In an arch pattern, the ridges flow in one side and out the opposite side; and account for roughly five percent of all fingerprints. The two types of arch patterns are plain and tented.
The three types of fingerprints that investigators may find at a crime scene are patent prints, plastic prints, and latent prints. Patent prints are visible prints that occur when a foreign substance on the skin of a person’s finger comes in direct contact with the smooth surface on another object. These prints are visible to the naked eye and typically occur when particles stick to the ridges of the fingers and are easily identifiable when left on an object. Plastic prints are those that occur when a finger leaves an indentation on a soft pliable surface. No enhancement is required in order to view these prints due to the impression that a finger leaves on the surface. Latent prints are impressions left by a finger that have secreted on a surface and are typically invisible to the naked eye. These prints are usually the result of perspiration from sweat pores in the ridges of fingerprints.
IAFIS is a fingerprint scanning system that stands for

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