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FS - fingerprints

fingerprint review patterns

QuestionAnswer
What are minutiae? unique features on a fingerprint
How many unique features are found on most fingerprints? about 150
List the three main fingerprint patterns or classes loops, whorls, and arches
What are the groups or types of arches? plain arches and tented arches
What are the groups or types of loops? right slant and left slant loops
What are the groups or types of whorls? central pocket, plain whorl, double loop, accidental
What is a delta in a fingerprint? the place where ridge patterns divide
What does AFIS stand for? Automated Fingerprint Identification System
What is live scan? A computerized way to collect fingerprints from a suspect
What are the 3 principles of fingerprints? 1 - fingerprint patterns do not change during a person's lifetime 2 - fingerprints are unique to each person 3 - fingerprints can be put into classes and categorized
What percent of fingerprints are loops? 60 - 65%
What percent of fingerprints are whorls? 30 - 35%
What percent of fingerprints are arches? About 5%
What is a latent fingerprint? Prints invisible to the naked eye made by sweat and oils on the skin
What is a visible print? Prints created by ridges touching a colored material such as blood, paint, grease, or ink
What are plastic prints? Prints left in soft material such as wax, soap, dust.
What is the purpose of AFIS? It is used to match fingerprint patterns.
What is the core of a fingerprint? the center part of a fingerprint pattern
What materials make up a fingerprint that has been left on a surface? water, oils, salts - also known as sweat
What is a delta in a fingerprint? Areas where the ridges run in opposite directions.
How many delta are found in an arch? zero
How many delta are found in a loop? one
How many delta are found in a whorl? two
What are ridges in a fingerprint? The raised area that leaves a pattern.
Created by: lb goodlock