Unit 4 – Forensics (Fingerprinting)
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Patent Fingerprints
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Visible fingerprints that are left on a smooth surface when blood, ink, or some other liquid comes in contact with the hands and is then transferred to that surface
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Plastic Fingerprints
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Actual indentations left in some soft material such as clay, putty, or wax
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Latent Fingerprints
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Surface fingerprints that are caused by the transfer of oil onto a surface
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In the friction ridges of the skin
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The imprint of a fingerprint consists of natural secretions of the sweat glands that are present
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Arches, loops, whorls
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Fingerprint characteristics are named for the visual appearance and patterns, such as (3)
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core and deltas
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Two things a forensic examiner looks for in a fingerprint
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plain whorl, double loop whorl and central pocket whorl
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Fingerprint whorl patterns may be
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plain arches
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Fingerprint arches may be
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Minutiae
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Every individual had a unique fingerprint resulting from the unique ridge patterns called
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Arch
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A fingerprint pattern in which the ridge pattern originates from one side of the print and leaves from the other side
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Core
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A center of a loop or whorl
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Delta
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A triangular ridge pattern with ridges that go in different directions above and below a triangle
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Fingerprint
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An impression left on any surface that consists of patterns made by the ridges on a finger
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Latent Fingerprint
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A hidden fingerprint made visible through the use of powders or other techniques
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Loop
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A fingerprint pattern in which the ridge pattern flows inward and returns in the direction of the origin
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Minutiae
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The combination of details in the shapes and positions of ridges in fingerprints that make each unique also called ridge characteristics
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Ridge Pattern
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The recognizable pattern of ridges found in the end joints of fingers that form lines on the surfaces of objects in a fingerprint
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Ten Card
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A form used to record and preserve a person's fingerprints
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Whorl
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A fingerprint pattern that resembles a bull's eye
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Ninhydrin
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To recover a fingerprint from a surface that is not smooth and hard requires different chemicals. The chemical used for paper is...
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Cyonacrylate
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Chemical used on household items
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Silver Nitrate
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Chemical used on wood and styrofoam
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Iodine Fuming
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Chemical used on paper, cardboard, and unpainted surfaces
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Super Glue
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It is possible to lift fingerprints using a fuming method involving which household product
