Forensics Fingerprinting Test

Ridge

appears dark on a fingerprint image

Valley

appears light on a fingerprint image

Plastic

impression fingerprints

Dermis

innermost layer of skin

Latent

invisible fingerprints

Basal

middle layer of skin

Epidermis

outermost layer of skin

Apocrine

sweat glands located in hair follicles

Eccrine

sweat glands located on hands and feet

Patent

visible fingerprints

The most common fingerprint pattern

Loop

The least common fingerprint pattern

Arch

Have ridges that enter from one side of the fingerprint and leave from the other side with a rise in the center

Arch

Looks like a bull’s-eye with two deltas

Whorl

Present in 30% of the population

Whorl

Have ridges that enter from either the right or the left and exit from the same side they enter

Loop

Fingerprints begin forming how many weeks into a female’s pregnancy?

10

Ninhydrin and Superglue can be used to lift invisible prints because they react with what part of the print?

Amino Acids found in Sweat

Silver Nitrate can be used to lift invisible prints because they react with what part of the print?

Chloride from Salt in Sweat

Which chemical produces a brown print that should be photographed because it fades?

Iodine

Which chemical should be heated in a vapor tent and produces a white print?

Cyanoacrylate Vapor

Which chemical can be used on wood or Styrofoam and turns a print black or brown-red?

Silver Nitrate

AFIS contains approximately how many fingerprint records

50 Million

FBI has found that no two individuals have:

More than 8 common minutiae

When a fingerprint expert take the witness stand and says he’s absolutely certain two fingerprints match, he means he’s found:

At least 12 or more matching minutiae

Bridge

Dot

Eye

Island Ridge

Delta

Trifurcation

Bifurcation

Double Bifurcation

Ending Ridge

Hook

What are the small white dots inside the ridges?

Pores