forensics hair quiz

fingerprints w/ percernts

fingerprints w/ percernts

• loops, 65%

• whorls, 30%

• arches, 5%

core

the center of a loop or whorl

delta

a triangular region near a loop

ridge count

counting from the core to the edge of the delta

purpose of ridge count

distinguishes one print from another

minutiae pattern

the study of ridge characteristics to identify an individual’s fingerprint

how do forensic analysts use minutiae pattern

compares common ridge patterns and minutiae patterns between suspect prints and evidence prints

silver nitrate can be used to lift latent prints because it reacts with what part of the print?

salt found in sweat

how did doctors attempt to remove John Dillinger’s fingerprints?

exposing each fingerprint to strong acid

Ninhydrin and superglue react with what part of the latent print

amino acids found in sweat

patent vs latent prints

patent - visible

latent - invisible

types of crime scene prints

latent - invisible

patent - visible

plastic - ridge impressions in soft material (wax, putty)

the raised part of the fingerprint is known as

friction ridge

what part of the fingerprint does iodine fuming react with

carbohydrates in latent print

what part of the fingerprint does cyanoacrylate vapor react with

amino acids

what part of the fingerprint leaves behind evidence

ridges

what part of the fingerprint does not leave behind evidence

valleys

fingerprint: enters on one side, exits on the other

arch

fingerprint: enters + exits on same side

loop

fingerprint: resembles whorl pool; begins in middle

whorl