fingerprints (1)

8/8/2019 Fingerprints (1)

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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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fingerprints (1)

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