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Danniela Trejos
Alessandra Morejon
Emmeline Echeverria
Yanely rodriguez
Fingerprints cannot lie, but liars can make
Fingerprints
-unknown
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The History of Fingerprints
During Chinas Tang dynasty (eighth
century AD), clerks used inked
fingerprints on business contracts.
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Dactyloscopy:
The Study of fingerprints. The word is
derived from the Greek daktulos,
meaning finger.
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The Anatomy of Fingerprints
Fingerprints have sweat pores, which is 98 to 99percent water. It is estimated that a fingerprintinitially may weigh 0.1 milligram, so after
evaporation of the water, we have left about 1microgram of residue, made up of half salt and halfcomplex organic compounds such as amino acid,lipids, vitamins and perhaps additional body oilspicked up on the finger by touching oily or hairy
parts of the body.
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Fundamental Principles of
Fingerprints.Fingerprints is an
individual characteristics.
Fingerprints remains unchanged
during an individuals life time.
Fingerprints have general characteristics
ridges patterns that permits them to be
systematically classified
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Did you know?That identical twins have the same
DNA but different type of
fingerprints.
That fingerprints cannot be removed.
(they can be remove but they would come back
after a period of time)
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Classification of Fingerprints
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Plain Arch
Fingerprint pattern in which the ridges
enter on one side of the impression and
flow or tend to flow out the other side with
a rise or wave in the center.
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Tented Arch
A fingerprint pattern which possesses
either an angle, an up thrust, or two of the
three basic characteristics of a loop.
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Ulnar Loop
A loop fingerprint pattern which flows in the
direction of the ulna bone, toward the little
finger.
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Radial Loop
A loop fingerprint pattern which flows in the
direction of the radius bone
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Plain Whorl
A whorl fingerprint pattern that
has two deltas and at least one
ridge making a complete circuit,
which may be spiral, oval,circular, or any variant of a
circle
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Central pocket Loop
A whorl type of fingerprint pattern havingtwo deltas and at least one ridge that make
a complete circuit.
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Double Loop whorl
A double loop whorl consists of two
separate and distinct loop formations with
two separate and distinct shoulders and
two deltas.
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Accidental Whorl
A type of whorl fingerprint pattern which is
a combination of two different types of
pattern, with the exception of the plain
arch, with two or more deltas; or a pattern
which possesses some of the requirementsfor two or more different types.
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Henry Classification System
Edward Henry developed a method of
Classifying fingerprints, later modified
By the FBI, that allowed all sets of ten
fingerprints in the world to be divided
into 1,024 groups.
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Ridge Classification
After classifying fingerprints according to general
patterns or groups, but
To individualize them you must use the fine structure
of ridge characteristic
Or minutiae.
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Percentages of fingerprints
60% Loops 35% Whorls 5% Arch
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Latent Prints
Latent print is by carefully dusting it with a fine
powder. This method is most
Effective on hard, nonabsorbent surfaces.
The color of the powder is chosen to
stand out against the surface being
examined.
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The 1933 Hamm Kidnapping
On a warm summer evening in 1933,
William A. Hamm, Jr., President of the
Theodore Hamm Brewing Company, was
working at his office in St. Paul, Minnesota.
He had just exited the building when he
was grabbed by four shadowed figures andpushed into the back of a car.
He was kidnap and forced to sign four ransom notes
The investigation of the Hamm kidnapping was the
First time silver nitrate method was used
successfullyTo visualize latent prints from forensic evidence.
By painting the evidence, in this case the ransom notes,
with a silver nitrate solution, the salty perspiration reacted
chemically to form silver chloride -- which is white and
visible to the naked eye. There they were: hard evidence
that the Karpis gang was behind the kidnapping.
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Madrid Bombings
On March 11, 2004, coordinated train
bombings in Madrid, Spain killed 191 people
And wounded 2,050.
after extensive and intrusive investigation,
on May 6 2004, the FBI arrested Brandon
Mayfield, an Oregon lawyer .A bag found by Spanish police containing
detonating device had fingerprints that were
Identified by the FBI as belonging to
Mayfield.
It turned out that Mayfields prints werenot at exact
Match to the ones on the bag.
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Quiz
1-Whats the name of the study of fingerprints?
2-Who created a method to identify fingerprints
easier?
3-On latent prints does the color of the powder ischosen carefully to contrast the surface? True
or false?
4-Do identical twins have same DNA or same
fingerprints? 5-How many milligrams does a fingerprint
weights?
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THE END