23 terms

Forensics Unit 06- Fingerprints

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arch
a fingerprint pattern in which the ridge pattern originates from one side of the print and leaves from the other side. Maybe tented or plain. Tented arches may have one delta
core
the innermost recurve of a loop or whorl. A whorl may have an upper and a lower one
delta
a triangular ridge pattern with ridges that go in different directions above and below a triangle
fingerprint
An impression or mark made on a surface by a person's fingertip, especially as used for identifying individuals from the unique pattern of whorls and lines.
IAFIS (Integrated Automated Fingerprint Identification System)
FBI developed national data base of more than 76 million criminal fingerprints and criminal histories.
latent fingerprint
a hidden fingerprint made visible through the use of powders or other techniques
loop
a fingerprint pattern in which the ridge pattern flows inward and returns in the direction of the origin with one delta
minutiae
the combination of details in the shapes and positions of ridges in fingerprints that make each unique; also called ridge characteristics
patent fingerprint
a visible fingerprint that happens when fingers with blood, ink, or some other substance on them touch a surface
and transfer the pattern of their fingerprint to that surface
plastic fingerprint
a three-dimensional fingerprint made in soft material
such as clay, soap, or putty
ridge count
the number of ridges between the center of a delta and the core of a loop
ridge pattern
the recognizable pattern of the ridges found in the end joints of fingers that form lines on the surfaces of objects in a fingerprint. They fall into three categories: arches, loops, and whorls
ten card
a form used to record and preserve a person's fingerprints
whorl
A class of fingerprints that includes ridge patterns that are generally rounded or circular in shape and have two deltas
dactyloscopy
Study of fingerprints
NGI
The acronym for Next Generation Identification, the updated version of IAFIS which includes facial scans
basal layer
fingerprints are formed in this layer of skin
cynanoacrylate vapor
latent prints on hard objects can be made visible by super glue fuming which reacts to amino acids on the skin
ninhydrin
used to make prints on paper visible. Makes the print purple
10 weeks
fingerprints are formed in the womb at about this time and become permanent because of exposure to amniotic fluid pressure and varying growth rates.
double loop whorl
sub category of whorl print that has a loop entering from both sides which creates two deltas thus classifying it as a whorl
accidental whorl
sub category of whorl print that may have three deltas
tented arch
sub category of arch print that may have one delta and looks like a pointed tent on top of the plain arch

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