fingerprints Flashcards
Explain the Bertillon system
identified people with body measurement (height, reach, width of the head, length of left foot)
Evidence say that fingerprint’s individuality was first recognized during _______
prehistoric time
in ____, William ____ suggests that fingerprints don’t change over life
1858
Herschel
Henry ____ suggests that fingerprints ____
Faults
can be used to identify one person
Francis _____ publishes a textbook and ______
Galton
types of fingerprints
In ___, Edward ____ invents ________ that we still use today
1899
Henry
system classification
A fingerprints is ____ and ____ shared by two people
individual
not
The skin of the fingertips ____ after _____. If major damage ____ can be used to identify people
repair
burn or shaving
scars
The valleys of the fingerprints = _____
The mountains of the fingerprints=_____
grooves
friction ridges
The friction ridges help with _______
friction/grip
Our skin secretes/picks up ___. Some of it is left behind when we touch stuff making a replica of ______
oil
the pattern of friction ridges
Name the 3 types of fingerprints
arch
loop
whorls
___ of the population has arch
5%
what are the two type of subgroups in arch
plain and tented
_____ of the population has loops
60-65%
_____ is when the loop points to the side of the thumb
____ Is when the loop points to the side of the pinky
radial
ulnar
___ of the population has whorls.
30-35%
Name the four types of whorls?
Plain whorls
central pocket loop whorls
double loop whorl
accidental loop whorl
when a ridge is a straight line we say it is a …
ridge ending
when a ridge seperates in two comme un fer a cheval we say it…
bifurcation
when a ridge seperates in two then reunites in one straight line we say it is…
a lake
When there is a small, lonely, line we say it is an…
independant ridge
when there is a small dot we call it a …
dot or island
when a line emerges from a straight line and leaves in another direction we call it a…
spur
when a line travels between two parallel lines we call it…
crossover
what is the goal of forensic fingerprinting?
Comparing two fingerprints and determine if they are form the same finger.
What is the name of the system that narrows down the number of fingerprints that could match?
Henry system
In the henry system, there are ___ fractions.
The ____ and ___ = 0 and the ____ changes depending on which fraction it is.
5
loop and arch
Whorl in the henry system is equal to... \_\_\_ 1 pair \_\_\_ 2 pair \_\_\_ 3rd pair \_\_\_ 4th pair \_\_\_\_ 5th pair
16, 8, 4, 2, 1
______ _______ ______ _____ _____
identify each fraction
R in - R ri - L th - L mi - L litt
R thu - R mi - R litt - L in - Lri
_____ individual ridges math for complete and ___ ___ for partial match
150
8-16
What is AFIS
computer cans, stores and look for the same special features a human would - but digitally t analayse fingerprints
What is the method to get the print of a suspect?
roll inked fingers on ten-print card. Each finger than palms
What is a patent print? How is it processed
material on their finger and leaves a visible print.
Photographed than transferred digitally
What is a plastic print
print in a 3D mold left in a soft substance
What is a latent print?
Print with oil on the finger, it is invisible
Explain the powder method to expose latent prints
Black, grey or fluorescent powder. Magnetically sensitive
Explain the laser/UV light method of exposing latent prints?
Makes print glow and has different filters. Doesnt alter the print
Explain the chemical reaction way of exposing the prints and why it isnt ideal?
Put chemicals on prints
it is stinky, dangerous and. bad for the environemnt
What is Ruvis
a camera, with UV lights, that detects prints and can take pictures of them.
What type of brush is used for powdering fingerprints?
Camel and fiberglass
Fingerprint tha are powdered will be lifted with…
transparent tape.
Name the 4 use of fingerprints in the world.
1) background checks
2) Biometric security (access spaces)
3) Mass disater or amnesiac victims idetification
4) Criminal situations
What are the 3 issues with fingerprints
1) need a print to compare to
2) can’t identify age, race, gender, etc.
3) can’t know how long prints have been there
What are the 3 main enemies of fingerprints?
1) dy hands
2) gloves
3) rougher surfaces.
What kind of surfaces we use the powder technique and the UV lights?
Hard surfaces such as mirrors, glass, tiles, painted wood
What kind of surfaces we use chemical reactions?
porous such as paper, cardboard, and cloth
