forensic science fingerprints
fingerprints are formed when?
10th week of pregnancy
approximately how many fingers are in the FBI master database of fingerprints?
450 million
What is AFIS?
Automated Fingerprint Identification System
what is a plastic fingerprint?
a fingerprint made in soft material like clay or putty - 3D
what is a latent fingerprint?
a latent fingerprint is a fingerprint made by the deposit of oils and perspiration that is invisible to the naked eye - hidden
a fingerprint pattern in which the lines start on one side, flow up and out the other side
arches
what type of animal hair is often used to make fingerprint brushes?
camel
the center of a loop or whorl
core
a small triangular region is one characteristic found in a fingerprint, this triangulation is called
delta
How many minutiae points must be in common in order for prints to be considered matches?
depends on the country
what is the most common method for detecting latent prints?
dusting
what part of the skin are fingerprints formed?
epidermis - even tho the basale covers the epidermis
With the aid of IAFIS, it is possible to obtain a "match" within several hours
false
fingerprint analysis has one been used in the last 100 years for solving crimes
false
fingerprints are considered to be class evidence
false
fingerprints are formed deep within the dermis layer of the skin
false
identical twins will have the same fingerprints
false
it is necessary to obtain a full print from a suspect in order to match his fingerprint with a fingerprint found at a crime scene
false
plastic prints must be dusted or treated in order to identify the ridge patterns
false
the type of powder used to dust prints will vary depending upon the weather conditions when the print is lifted
false
What is a dactylogram?
fingerprint
the use of fingerprints in identification is not perfect because
human error
what type of evidence are fingerprints?
individual
a print found at a crime scene is called what?
latent
what are the basic types of fingerprints?
latent, plastic, patent
a fingerprint pattern where ridge lines flow inward and return out the same side
loops
what are the three main fingerprinting patterns? what is the most common? least common?
loops whorls arches
superglue fuming (Cyanoacrylate) works for prints on what surfaces?
metal
Points on a fingerprint where ridge characteristics change are called
minutiae
what aspect of a fingerprint chemically reacts with each of the following?
ninhydrin - they get with and mix with amino acids and proteins from sweat
are fingerprints of the left hand mirror images of the fingerprints on the right hand?
no
can fingerprints be permanently removed w/ chemicals?
no
Describe how to take a ridge count from a fingerprint
start at the core or delta and count out
what is normally used to lift a fingerprint?
tape
The use of fingerprints in identification is not perfect because
the current technology depends on humans to input and analyze the information and humans make mistakes
fingerprints are a result of oil and secretions from skin mixing with dirt
true
loops are the most common form of fingerprints
true
similar print or ridge patterns can also be found on the toes
true
a fingerprint that resembles a bulls eye
whorl
with the help of AFIS, it is possible to obtain a match within several hours
yes/true
