unit 4: fingerprintstinamhall.weebly.com/.../46654775/unit_4.5_-_fingerprints_lecture.pdf · 4 –...
TRANSCRIPT
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Unit 4: Fingerprints Forensic Science
1
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Warm-Up
March 16, 2015
1. What causes fingerprints?
2. Can they be altered?
3. What makes fingerprints unique?
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Objective
• SWBAT
– Discuss origination and need for fingerprint
identification.
– distinguish fingerprints due to unique
characteristics.
– compare fingerprint detection techniques.
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Agenda
1. History of Fingerprints
2. Types of Fingerprints
3. Fingerprint Detection
4. Henry Classification System
5. Forensic Files
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History of Fingerprinting
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What is a Fingerprint?
• The impression left by a finger’s friction ridges upon contact with a surface
• DACTYLOSCOPY
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What is a fingerprint?
• Folds in the basal layer of the epidermis are formed during the 8th week of fetal gestation.
• These folds are reflected on the surface skin.
• These ridges remain unchanged throughout life.
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History of Fingerprints
• Fingerprints were not always used to identify people…
• Alphonse Bertillon’s Anthropometry measurements were used to identify prisoners in the 1880’s.
• The Will West case brought the need for a better system to light.
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Partner activity
• Read and discuss the Will West case
article.
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History of Fingerprints
•Over 3,000 years ago fingerprints were
used in ancient China.
• In ancient Babylon some people signed clay
tablets with their prints.
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History of Fingerprints • 1858: William Herschel, a British
civil servant stationed in India, required natives to sign contracts with hand imprints
• 1880: In Japan Scottish doctor Henry Fauld published his views on using fingerprints to identify criminals (Used FP on whitewashed wall to ID a thief)
• 1892: Englishman Francis Galton published the textbook Finger Prints discussing anatomy, patterns, and recording techniques.
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History of Fingerprints
• 1891: Police officer Juan Vucetich devised a
workable fingerprint system in Argentina
• 1897: Englishman Sir Edward Richard Henry
developed another classification system that
was adopted by the Scotland Yard 4 years later.
– Most English-speaking countries still use some
version of this classification system today!
• 1903: Will West case
• 1904: Scotland Yard officers train American
police officials in fingerprinting at the World’s
Fair in St. Louis
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History of Fingerprints
• 1924: Fingerprint Records of the Bureau of
Investigation and Fort Levenworth prison were
merged and became the core of the identification
records of the new FBI.
• 1970’s: New technology allowed for the
classification and retrieval of fingerprints by
computers; AFIS (Automated Fingerprint
Identification Systems) was born.
• 1999: state AFIS systems were linked to FBI
databases to form IAFIS (Integrated Automated
Fingerprint Identification Systems).
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History of Fingerprints
• 1999: Admissibility of fingerprint eveidence was challenged in the case of United States. vs. Byron C. Mitchell, but the judge ruled that human friction ridges are unique and permanent.
• Today: Fingerprints can be scanned digitally
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Timeline Activity • Create a colorful, pictorial timeline to organize
important events in fingerprint history.
• Include name, year, and description for: – Ancient use
– Bertillon system
– Herschel
– Fault
– Galton
– Henry
– Will West case
– New FBI ID system
– AFIS
– IAFIS
• …and any other info you feel is pertinent
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Principles of Fingerprints
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Types of Fingerprints
• Patent which means... ?
• These are visible prints made by touching
a smooth surface after the ridges have
been in contact with a colored material
such as blood, ink, paint, grease, etc.
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Types of Fingerprints
• Plastic which means…?
• These are actual impressions left by finger
ridges in a soft material such as putty,
wax, soap, dust, clay, etc.
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Types of Fingerprints
• Latent which means…?
• These are invisible prints caused by the
transfer of body perspiration or skin oils
present on finger ridges to the surface of
an object.
Developed
latent print
shown under
UV light
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3 Fundamental Principles
1) A fingerprint is an individual
characteristic; no two fingers have yet
been found to possess identical ridge
characteristics.
- According to Galton’s estimates, there are
64 billion possible fingerprints, (probably
more)
- FBI has ~50 million prints in its database
and so far no two are alike
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3 Fundamental Principles
2) A fingerprint remains
unchanged during an
individual’s lifetime.
- The pattern of the dermal
papillae formed during fetal
development does not change
- Even if damaged, fingerprints
grow back
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3 Fundamental Principles
3) Fingerprints have general ridge
patterns that permit them to be
systematically classified
- an older system assigns point values to each
digit if it contains a whorl pattern, and then puts
that into a formula
right left
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Classifying Fingerprints
• Fingerprint characteristics are named for their general visual appearance and patterns.
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Classifying Fingerprints
ARCH LOOP WHORL
65% 30% 5%
(percent frequencies in the general population)
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Fingerprint Characteristics
• Loop
A loop must have one or more ridges
entering and exiting from the same
side. Loops must have one delta.
Types
Radial—opens toward the thumb
Ulnar—opens toward the “pinky”
(little finger)
Which type of loop is this, if it is on
the right hand? Left hand?
Triangular region: “delta”
Center of loop: “core”
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Special Loops
• The double loop is
made up of two
loops combined
into one fingerprint.
• The pocked loop
has a small circle at
the core.
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Fingerprint Characteristics
• Whorl
A whorl has at least one ridge that
makes a complete circuit. Whorls
have at least two deltas and a core.
Types
Plain whorl
Central pocket whorl
Double loop whorl
Accidental whorl deltas
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Whorl Subtypes
A line drawn
between the deltas
touches at least
one ridge in the
inner pattern
A line drawn
between the deltas
does not touch the
inner pattern
Has 2 separate
loop formations and
2 deltas
CRAZY!
(but has at least 2
deltas)
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Whorl accidental Patterns
• An accidental pattern contains two or
more patterns, but not the plain arch, and
is not covered by other categories.
• It may consist of a combination loop and
plain whorl or loop and tented arch.
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Fingerprint Characteristics
• Arch
An arch has friction ridges
that enter on one side of
the finger and cross to
the other side while rising
upward in the middle.
They do NOT have deltas
or cores.
Types
Plain
Tented
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1 – Blow up your balloon about halfway and twist the end to keep
the air from coming out. Do not tie it off!
2 – Use an ink pad to make a print with two of your fingers and
label each one with a permanent marker. Write your name on the
balloon as well.
3 – Blow up the balloon to full size and tie the end.
4 – Analyze the fingerprints to categorize as loop, whorl, or arch
characterization.
Try It!
Balloon Fingerprint Activity: http://www.msichicago.org/fileadmin/Education/learninglabs/lab_downloads/fingerprint_analysis.pdf
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Comparing Fingerprints
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Comparing Fingerprints
• Criminals aren’t usually nice enough to leave a
full 10-print set to run through an IAFIS
database
– Usually investigators have a single print or just a
partial print to analyze
• There is no one official number of comparison
points an investigator must find to declare that
an identification has been made, though most
use 10-16 points.
– Each investigator determines how many is
appropriate
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Levels of Comparison
• Level 1: details include looking at general
features and patterns. These cannot be
used for individualization, but can rule out
some suspects.
34 Crime Scene Suspects
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Levels of Comparison
• Level 2: details include particular ridge
characteristics (“minutiae”) that enable
individualization of an unknown print.
– Not only is having the same number of these
minutiae match up between 2 prints, but also
that they are in the same relative position
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Rid
ge
Ch
ara
cter
isti
cs
Use these characteristics as points of identification when comparing fingerprint
samples. The more points you can find in common, the better the match!
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37
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Levels of Comparison
• Level 3: details require a low-power
microscope to uncover minute
imperfections in a print such as cuts,
scars, edge shapes, ridge contours, and
even sweat gland pores.
– Note: this level of comparison depends on
how good of a fingerprint picture you have.
38
pores
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A Closer Look at Fingerprints
Image from ftp://sequoyah.nist.gov/pub/nist_internal_reports/ir_6534.pdf T. Trimpe 2007 http://sciencespot.net/
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Ridgeology: The study of the uniqueness of friction ridge
structures and their use for personal identification.1
1Introduction to Basic Ridgeology by David Ashbaugh, May 1999 Image from http://www.cs.usyd.edu.au/~irena/minutia.gif
The koala is one of the few mammals (other than primates)
that has fingerprints. In fact, koala fingerprints are
remarkably similar to human fingerprints; even with an
electron microscope, it can be quite difficult to distinguish
between the two.
As we have learned in our first lesson, a
fingerprint is made of a series of ridges and
valleys on the surface of the finger. The
uniqueness of a fingerprint can be determined
by the pattern of ridges and valleys as well as
the minutiae points, which are points where the
ridge structure changes.
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Fingerprint Identification
When minutiae on two different prints match, these are called
points of similarity or points of identification. At this point
there is no international standard for the number of points of
identification required for a match between two fingerprints.
However, the United Kingdom requires a minimum sixteen
points while Australia requires twelve.
Automated Fingerprint Identification System (AFIS)
http://www.fdle.state.fl.us/CrimeLab/images/fingerrint%20comparison%20for%20afis.jpg
AFIS is a computerized system capable of
reading, classifying, matching, and storing
fingerprints for criminal justice
agencies. Quality latent fingerprints are
entered into the AFIS for a search for possible
matches against the state maintained databases
for fingerprint records to help establish the
identity of unknown deceased persons or
suspects in a criminal case.
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http://cnx.org/content/m12574/latest/properties.jpg
Ridge Characteristics
Crossover
Core
Bifurcation (fork)
Ridge ending
Island
Delta
Pore
Scar
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http://www.dkfz.de/tbi/projects/bmcv/images/iu_it246_04s_fingerprint1.jpg
How many ridge characteristics can you identify in this fingerprint?
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Identify each fingerprint pattern.
Right Hand
Left Hand
Left Hand
Right Hand
Right Hand
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Common Questions about
Fingerprints
1) Can you sand off fingerprints?
– Yes it is possible, but it will leave scars on
your hands that will be permanent and
unique, creating more individuality to your
fingerprints. This would ultimately make your
fingerprints easier to identify.
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Common Questions about
Fingerprints
2) Can you surgically alter your fingerprints
by cutting them off all the way down to the
dermal papillae?
– Yes, it is possible, but no successful cases
have been noted.
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Common Questions about
Fingerprints
3) Can you graft someone else’s surgically removed fingerprints onto yours?
– Yes it is possible, but again no successful cases in a criminal arena have been noted. A plastic impression of someone else’s fingerprint can be made and then that piece of material can be laid over your fingerprint. This has been depicted on TV and movies and it does work.
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(Mythbusters clip)
• Background: The Mythbusters crew is
trying to see if they can fool fingerprint
scanners (on a laptop and a fancy door
lock) with their teammate’s fingerprint over
their finger, made from/on
• Flexible ballistics gel
• Latex
• Printed on paper
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Taking Fingerprints:
Ten-print
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Review
• Q:What are fingerprints used for?
• A: A variety of purposes including:
– Solving crimes
– Identity confirmation (passport, cashing
checks, etc.)
– Determining the identity of the deceased
– Entrance control for buildings and rooms
– Clearance for employment
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It’s time to make
some prints!
Avoid
Partial
Prints GOOD PRINT
Get as much of the top part
of your finger as possible!
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Creating a “Tenprint” Card
• You may have had your fingerprints taken
before, and someone else probably helped
you with it.
• It is unlikely that you were allowed to
stamp official fingerprints on your own.
• By having a specially trained person take
prints, the results should be more uniform
and better suited for further analysis.
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Taking a Tenprint
• “Tenprint” refers to a standardized card
containing inked fingerprints for all ten
fingers.
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Taking a Tenprint • Each finger is assigned a number. The
tenprint card usually also has the finger
written out.
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Step 1: Communicate
• (clean fingertips with alcohol to remove oils)
• Tell your subject that you are going to take
their prints
• They should relax their hands, and let you do
all the work.
• If they try to “help,” stop, ask them to let you
control their hands.
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Step 2: Rolled Prints
• Print each finger, one at a time
• Roll the finger on the inkpad from side to side
to cover the whole tip in ink
• Roll fingers side to side, one at a time, onto
the tenprint card without pressing down
• Print should be wide and not resemble
typical print size, may appear square
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Step 3: Plain Impressions
• The bottom of the card has a space for 4
fingers at once, as well as a space for a
“plain” print for each thumb.
– Roll the 4 fingers on the pad from the top
down to cover them in ink
– Print all 4 fingers at once onto the bottom of
the card.
• Do the left set first, then right.
– Finally, ink the thumbs.
– These prints will have the typical size and
shape, instead of the rolled square. 57
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Step 4: Clean Up
• Remove the print card
• Rub soap into fingers’ friction ridges to
remove ink
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Factors Affecting Fingerprints
• Negative effects could arise from:
– Allowing subjects to print themselves
– Excessive pressure
– Not enough pressure
– Perspiration, wetness
– Sickness/disease
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Special Situations
• Sometimes full fingerprints may not be
available because of:
– Amputations
– Bandaged fingers or hands
– Scars
– Deformities
– Worn fingerprints
– Extra fingers
– Webbed fingers
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Development of
Latent Fingerprints
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Review…
• Fingerprint Composition
– Sweat
• ~99% water
• ~1% solids such as amino acids and salts
– Oils and fats (sebum)
– Bodily fluids (blood, saliva, mucus, semen, etc.)
• Latent fingerprints – hidden prints caused by
the transfer of oils and other bodily secretions
onto a surface.
– They can be made visible by different methods
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Fingerprint Powders • Applied lightly to a
nonabsorbent
surface with a soft
brush.
• They readily adhere
to sweat residues
and/or deposits of
body oils left on the
surface.
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• Gray and black powders – the
most common, chosen to make the
best contrast with the surface
• Magnetic powder – applied with a
Magna brush on leather and rough
plastic surfaces.
• Fluorescent powders – used to
photograph latent prints on multi-
colored surfaces. They fluoresce
under ultraviolet light.
Fingerprint Powders
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Chemical Development
• Ninhydrin – reacts with amino acids in
sweat to form purple-blue prints. A 0.6%
solution (in ethanol or acetone) is sprayed
onto porous surfaces such as paper.
This method has
been shown to
work well on older
papers, even a
letter 15 years old!
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• Physical Developer – silver nitrate-based
liquid reagent used on porous surfaces.
Chemical Development
– Can be used on samples that
have previously been wet
– Reacts with fats in
fingerprints to produce a
silvery-grey deposit
– It is often used as the last
resort because it destroys
protein.
“old school”
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• Cyanoacrylate (superglue) fuming –
developed in 1982 by the Japanese. It is
used on a variety of materials not only to
visualize latent prints, but also to semi-
permanently affix them to the surface.
Chemical Development
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• Iodine fuming: one of the oldest latent print
development methods.
– Solid iodine crystals sublimate and the vapor will
react with fatty oils and some sweat residue.
– The brown Iodine prints are not permanent and
will begin to fade once the fuming process is
stopped.
Chemical Development
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• Rhodamine 6G: a fluorescent
dye that may be used after
cyanoacrylate fuming to
visualize latent prints under UV
light. Good for multi-color
surfaces
• Amido Black – protein dye
stain that can develop faint
bloody fingerprints on porous
and nonporous surfaces.
Chemical Development
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Chemical Development of
Latent Fingerprints
chemical method advantage/reason to
using it what do developed
prints look like?
ninhydrin older paper purple-blue
physical developer (silver nitrate)
can be used on previously wet surfaces
silver-grey
cyanoacrylate (AKA superglue fuming)
cheap and easy, permanently fixes
prints
white
iodine fuming oldest method, simple, non-
permanent brown
rhodamine 6G fluorescent, good for multi-
colored surfaces fluorescent/glow
amido black works on faint bloody prints purple-black
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• Photograph
• Covering the print to preserve it in its
entirety (if on a small object)
• Lifting the prints with adhesive tape and
placing the tape with prints on a card with
labels
Using Developed Fingerprints
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• It is NOT possible to determine the age, sex or
race of an individual solely from their fingerprints.
However:
– Friction ridges of young women are usually finer than
those of young men.
– Fine ridges may be found in the very young and the
very old.
– Manual labor tends to strengthen ridges.
– Women tend to perspire at a lower rate than men.
– Sodium chloride (NaCl) is lower for women.
– Creases are more common in women's FPs.
Trends with Fingerprints
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RESOURCES • Saferstein, Richard. Forensic Science: An Introduction. New
Jersey: Pearson Prentice Hall, 2008.
• Bertino, Anthony J. Forensic Science: Fundamentals and
Investigations. Mason, OH: South-Western Cengage
Learning, 2009.
• Fisher, Barry A.J. Techniques of Crime Scene Investigation.
7th ed. Boca Raton, FL: CRC Press, 2004.
• Federal Bureau of Investigations
http://www.fbi.gov/hq/lab/fsc/backissu/jan2001/lpu.pdf
• Investigation Discovery
http://investigation.discovery.com/videos/forensics-videos/
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Copyright © Texas Education Agency 2011. All rights reserved.
Images and other multimedia content used with permission.
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Resources • Saferstein, Richard. Forensic Science: An Introduction (2011). Prentice Hall, pp.
532-571
• Bertino, Anthony J. Forensic Science: Fundamentals and Investigations. (2012)
South Western/Cengage Learning, pp. 132-157.
• Seigel, Jay A., Mirakovits, Kathy. Forensic Science: the basics. (2010) CRC
Press, pp. 144-173.
• http://www.onin.com/fp/fphistory.html
• http://sirchie.com
• http://www.fbi.gov/hq/cjisd/iafis.htm
74 Copyright © Texas Education Agency 2011. All rights reserved.
Images and other multimedia content used with permission.