Topics on Your Test! • Identify types of fingerprints left at a scene based upon description • Latent, plastic, visible • Chemical development techniques • Superglue, Silver Nitrate, Iodine, Ninhydrin • Which technique is best for different surfaces • Identify general ridge pattern • Whorl, Loop or Arch • Identify minutiae • Compare prints to determine if they are the same or different and give explanation to your determination • Primary Classification • AFIS
In the womb approximately 10.5 weeks estimated gestational age. It is thought that the movement of the fetus is what contributes to the unique ridge characteristics.
First Principle: A Fingerprint is an Individual Characteristic; No two fingers have yet been found to possess identical ridge characteristics.
This individuality of a fingerprint is not determined by its general shape or pattern but by a careful study of its ridge characteristics, also known as minutiae.
Second Fundamental Principle of Fingerprints: A Fingerprint will remain unchanged during an individual’s lifetime.
Third Principle: Fingerprints have general ridge patterns that permit them to be systematically classified. All fingerprints are divided into three classes on the basis of their general pattern: Loops, Whorls, and Arches.These three classes form the basis for all 10-finger classification systems.
What is it called when a dot or short ridge have ridges on either side of them?
Which minutiae or ridge characteristic occurs when a friction ridge bifurcates (forks) and then converges (joins back together) to form a continuation of a single ridge?