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Ch 14 Fingerprinting
Terms in this set (46)
examination of fingerprints for purposes of identification
What helps us grip objects?
What appears dark on a fingerprint?
What appears light on a fingerprint?
What week of pregnancy do fingerprints form?
How long is the baby when fingerprints are formed?
Inner layer of skin
outer layer of skin
layer in between
which cells in the skin grow faster?
apocrine and eccrine
associated with hair follicles
located on ridges of hands and feet
center of loop or whorl
triangular region located near a loop
Have ridges that enter from one side of the fingerprint and leave from the other side with a rise in the center
Have ridges that enter from either the right or left and exit from the same side they enter
have at least one ridge that makes a complete circuit. like like a bull's eye with 2 deltas
type of arch where ridges enter on one side and exit on the other side
type of arch that has a spike in the center
Type of loop that opens up towards the radius bone (left) of the arm
type of loop that opens up towards the ulna bone (right) of the arm
type of whorl made up of any 2 loops combined into one print
double loop whorl
type of whorl that does not fit into any other category
if the curve ridges of a line touch the line it is a _____________ whorl
if none of the center core touches the line is is a _________________ whorl
unique ridge patterns; points where print ridges come together or end
no 2 individuals have more than __ common minutiae
it is absolutely certain two fingerprints match when about __ or more minutiae match
visible prints that are left on a smooth surface when blood, ink, paint, grease, or some other liquid comes in contact with the hands and is transferred to a surface
actual indentations left in some soft material such as clay, putty, or wax
prints that aren't visible to the naked eye and are caused by the transfer of oils and other body secretions on a surface
latent prints can be visible by using
To dust for fingerprints, what do you dust the surface with?
used to lift and preserve a fingerprint
tape or metal/magnetic powders
Reacts with amino acids to produce a purple color; takes 24 hours; used on paper
reacts with amino acids to form white print; heat sample in vapor tent; household items: plastic, metal, glass, and skin; also known as Super Glue Fuming
chloride from salt in sweat on a print combines with this to form dark colored prints under UV light; object is dipped or sprayed with this; wood styrofoam
iodine combines with carbohydrates in latent print;brown print that fades quickly; in a vapor tent, heat solid iodine crystals; paper, cardboard, unpainted surfaces
What are the primary precautions in all cases dealing with fingerprints?
prevention of adding fingerprints to evidence or of destroying those present
a fingerprint is an ________________ characteristic
fingerprints can only change due to
permanent scars or skin diseases
scars make prints even more
method of fingerprinting still used today
Galton Henry Method
fbi electronic storage and search program for fingerprints
AFIS (Automated Fingerprint Identification System)
how many fingerprints does the AFIS contain?
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