Fingerprint Principles According to criminal investigators, fingerprints follow 3 fundamental principles: 1. A fingerprint is an individual ______________; no _____ people have been found with the exact same fingerprint __________. 2. A fingerprint ___________ will remain ____________ for the life of an individual; however, the _________ itself may change due

Fingerprint Factoid Approximately ________of people have loops,

_________ have whorls, and ______ have arches.

to_________________________. 3. Fingerprints have general characteristic __________________ that allow them to be __________________________ identified.

Ridge Characteristics

Core

Dot or Island

Eye

Enclosure

Ending Ridge

Fork or Bifurcation

Delta

Specialty

Short Ridge

Hook

Bridge

Crossover

How many different ridge characteristics can you find on this fingerprint? Circle

and Label.

http://www.dkfz.de/tbi/projects/bmcv/images/iu_it246_04s_fingerprint1.jpg

Did you know? _____________________ is the study of fingerprint identification. Police _______________ are experts in collecting ______________ otherwise known as fingerprints.

Can you identify each pattern?

A

(L) (R)

(R)

(R)

(L)

B

C

D E

IAFIS stands for

_______________________________________________________. IAFIS is a ________________________ maintained by the

________. Besides fingerprints, it also contains _________________________

_______________________________________________________. It holds information for more than _______________________

criminals as well as ____________________________ civilians. Many matches can be determined in _________________________.

Did you know?

Latent Prints Latent prints are ___________________ to the naked eye.

These prints are the result of

___________________________. The

____________________ left on an ______________ leaves

a distinct ______________ of the

_____________________.

*Prints may be collected by revealing them

with a dusting of ________________ and

then lifted with a piece of

________________________.

*Some investigators use _________________ powder and

_________ lights to help them find latent prints on

_______________ or dark surfaces.

*_______________ powder can also be used to reveal

latent prints and works on ___________ surfaces or plastic

baggies or _____________________.

*The cyanoacrylate fuming method (super glue method) is

a procedure that is used to develop fingerprints on a variety

of objects.

*___________________ is a chemical that _________ with

the amino acids in fingerprints and will produce a

_________ or purple color. It works well on paper or

cardboard surfaces.

Camel hair is the most common animal hair used to make fingerprint brushes. Now many brushes are made out of fiberglass.

PLASTIC PRINTS – are ___________, impressed prints that occur when a finger touches a soft, _______________________ resulting in an indentation. Some surfaces that may contain this type of fingerprint are those that are freshly painted or coated, or those that contain_______, _______, blood or any other substance that will __________ when hand held and then retain the finger ridge impressions. These _________ require no _________________ in order to be viewed, because they are _______________ onto an object and are easily observable.

PATENT PRINTS - are visible prints that occur when a _____________ substance on the skin of a finger comes in __________ with the smooth ___________ of another object. These prints leave a ___________ ridge impression that is visible with the naked eye without _________________ enhancement of any kind. The tried and true "blood on his hands" evidence is an example of patent prints recovered from a crime scene or scene of interest to investigators. These foreign substances contain ___________________ which ____________ to the _________ of the fingers and are easily __________________ when left on an ___________.

ct.

Fingerprint Classes

1. How are plain arches and tented arches different?

_________________________________________________________________________________________

_______________________________________________________________________________________

2. Loops must have one ______________ and one or more _______________________ that enter and

_____________ on the same ____________________.

3. _______________ have at least _____________ ridge and at least ___________ deltas. This type of print

tends to make a ______________________________________.

Notes for 5 facts about fingerprinting you probably didn't know. https://www.youtube.com/watch?v=lAnr8RKUnk4&t=6s

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5. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Why do we have fingerprints? https://www.youtube.com/watch?v=7s2ZUDrCIEg

Write a summary of the video incorporating FIVE facts from the video.

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