Fingerprints

No two fingerprints the same? T or F ?

10 -12 points are compared to determine a statistical MATCH in the US

Points are called Minutia

Patterns

whorl

Double loop

Tented arch

Visible in a fetus Dermal papilla patterns deep under skin Moisture (oils/sweat) released from pores

Lines are called typica Lines can END or BIFURCATE

What causes a fingerprint?

1, 4 and 5:                        Bifurcation   2, 3, 7, 8, 9 10 and 11:     Ridge End     6:                                      Core

pores

Automated Fingerprint Information Systems Arrange likely candidates by score Matches are HUMAN identified

AFIS

Bottle print Police print

YES - Match

Yes-match

APIS since 1996

Palm Prints

koala. Koalas have ridges on their fingers which create fingerprints almost identical to those of human beings. Koalas have two thumbs on each hand and they also have claws instead of fingernails. Human beings have ridges over all of their palms, whereas koalas only have ridges over part of their palms.

Which animal is said to have fingerprints virtually indistinguishable from those of human beings?

Koala vs human

textiles are very absorbent.

Why is it usually impossible to obtain fingerprints from textiles such as fabric, clothing and carpet?

Argentina. In 1892, Juan Vucetich, a police researcher in Argentina, used fingerprints to prove that Francesca Rojas murdered her two children by taking her thumb print and matching it to a bloody thumbprint left behind on a door. When confronted with the evidence, the mother broke down and admitted killing her children because they stood in the way of her marriage to a young lover. She was subsequently convicted and sentenced to life imprisonment

In which country was the first case of a conviction based on fingerprint evidence?

burglary. Henry Jackson was a burglar who placed his hands in wet paint during a robbery, thus leaving behind his fingerprints. Jackson was sentenced to seven years in jail for stealing billiard balls.

In 1902, Henry (Harry) Jackson became the first person in the United Kingdom to be convicted on fingerprint evidence. What was his crime?

murder. Thomas Jennings was convicted of murder after he broke into a house and shot the home-owner during an attempted burglary. He left his prints behind on a freshly painted railing. This was the first American murder trial to admit fingerprint testimony. Although the verdict was appealed, the Appeals Court accepted that the fingerprint evidence was scientifically valid. Jennings was hanged.

In 1910, Thomas Jennings became the first person in the United States of America to be convicted on fingerprint evidence. What was his crime?

Odd prints

Healthy- disease- recovery

- The most common way is leaving fat from the finger on the object.- It is also possible that Amino-acids from the finger leave their marks.- A finger can make a "stamp" in a soft underground like putty.- A mark can be made by a substance on the finger like blood or paint.

Transmitting prints to a object.

Ninhydrin result: bonds to amino acids

Cyanoacrylate (superglue)

Powders: bond to oils

NOT the same as DNA “fingerprint”