Forensics - fingerprinting test review

Plain arch

enters one side, exits other side

Tented arch

spikes up in the middle

plain whorl

includes deltas

central pocket whorl

tight ridges

double loop whorl

any 2 loops combined to one

accidental whorl

arch + loop

radial loop left hand

enter from right, leaves on right

ulnar loop left hand

enters from left, leaves on left

different types of ridge structures

core, ending ridge, short ridge, enclosures, dot/island, eye, bridge, hook, fork/bifrication,

what is marked in this picture?

ridge ending

what is marked in this picture

an eye

what is marked in this picture

hooks

what is marked in this picture

bifurcation

what is marked in the picture

dot or island

there are __ catagories of fingerprints

3 (loop arch whorl)

what is the technical detail for small details in a fingerprint?

minutiae

this fingerprint lifting method is used on dark surfaces…

fluorescent

this fingerprint lifting method is used on shinny or plastic surfaces…

magnetic/black powder

this fingerprint-lifting method is a fuming method that can distort the fingerprint…

cyanoacrylate/super glue

what fingerprint type is the most and least common?

most - loops

least - arches

fingerprints are left behind because of…

oil and salt deposits on fingertips

what creates a latent print?

sweat or oil on our hands

the following fingerprint is

a whorl with two deltas

an arch fingerprint is like

a hill

whorl fingerprints can be classified into…

4 catagories

it is difficult to retrieve fingerprints from

fabric surfaces

fingerprints are extremely important evidence

because no two people have the same fingerprint, and everyone’s fingerprint is unique.

uniqueness of a fingerprint can be found in

It’s core and deltas

what is AFIS?

automated fingerprint identification system. (stores and matches fingerprints)

latent print

a print that is left behind or an “invisible” print. can be seen by dusting with powders of chemicals.

patent fingerprints

visible print after ridges have been in contact with blood, paint, ink or grease.

the chemical method of choice for visualizing latent prints is…

ninhydrin

original fingerprint system adopted by Scottland Yard in 1901

Henry system

First fundamental principle of fingerprints

a fingerprint is an individual characteristic.

second fundamental principle of fingerprints

a fingerprint remains unchanged during an individuals lifetime

third fundamental principle of fingerprints

have general ridge patterns that permit them to be systematically classified.

on a leather sofa, would you use chemicals or powder to discover latent prints?

Chemicals.

on a painted wooden handle, would you use chemicals or powder to discover latent prints?

Powder.

magnetic powder

used to reveal latent prints on shinny surfaces, plastic bags or containers.

plastic print

ridge impressions left on a soft material