Fingerprints

What is the estimated number of how many ridge characteristics there are in an average complete fingerprint?

150

What is the minimum number of ridge characteristics necessary before two fingerprints can be identified as the same?

16

How and when are fingerprints formed?

during fetal development

Where are the pores of the sweat glands located in?

dermis layer

what are prints that are not readily available to the naked eye commonly referred as?

latent prints

What is the most common ridge pattern?

Loops, 60% of people

What is AFIS?

Automated fingerprint identification system that helps classify fingerprints from databases

Prints impressed in a bar of soap are referred to as

Plastic prints

common non porous surfaces

glass, mirrors, plastic, tape

Ninhydrin is used on a latent fingerprint to detect

prints

what do physical fingerprint liquid developers contain

silver nitrate

in which order should chemical treatments to visualize latent prints be performed?

ninhydrin, iodine fuming, physical dev

Superglue fuming is NOT suitable for use on what surfaces?

Porous surfaces

what chemical treatment produces a white-appearing latent print?

Super glue fuming

what is most often used in conjunction with chemically induced fluorescence to visualize latent prints?

UV light or RUVIS

after successfully visualizing a latent print on an object an investigator should do this next

lift it

which of the following types of fingerprints are more likely to be found impressed in soft wax?

plastic prints

what fingerprint pattern accounts for only 5% of all known patterns?

arches

protein residues are best developed into fingerprint impressions with

ninhydrin

A point-by-point comparison of a fingerprints _______ must be determined in order to ____________

minutiae, to prove identity