fingerprints pt 1 Flashcards
anthropometry
alphonse bratillion; measurements of body (head, height, length of let foot)
dermal papille
area where fingerprint lay
latent fingerprint
fingerprint placed there by oils on hand
minutiae
another word for ridge characteristics
friction skin ridge
prevent slipping and grip objects; found on the palm side of fingers
primary classification
current system used for fingerprint ID
Fauld
original person to suggest fingerprint ID
Galton
proposed fingerprint t typing to Scottland Yard
first fundamental principle
no two fingerprints are alike
second fundamental principle
remains unchanged
third fundamental principle
gen. ridge patterns that define them; loop, arch, whorl
loop
60-65%; ulnar and radial; one delta; core in center
whorl
30-35%; plain- line touching all, central- line only touch in center, double- ying yang, accidental- least common; two deltas
arches
5%; plain- enter one side exit another(wave like), tented- sharp spike in ridges at center; no delta
how are ridge characteristic used to identify fingerprints
location, number, identity
when do fingerprints develop
10-11 weeks in utero
1/1
no whorls
how many ridge characteristics are on one fingerprint
150
first person convicted with a fingerprint
1911; Thomas Jennings
how many groups of fingerprints
1024
plastic fingerprint
a print in something soft like clay or soap
visible print
a print in blood or something liquid
porous surfaces
surfaces that would absorb something; use chemical methods to uncover them
non porous
a solid surface; use powder
