forensic science fingerprints

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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


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