Fingerprint: the lines formed by the skin on the upper part of the abdomen at the ends of fingers, which increase friction when touching things and make it easier to grasp things. Is naturally formed in evolution. There are three kinds of fingerprint lines: bucket type, bow type and dustpan type, which are all caused by the different directions of subcutaneous tissue and finger pulp. Research shows that the finger pulp is high and round, and the lines are spiral. Scientists have been able to reproduce ordinary fingerprints and repeat the formation process of ordinary fingerprints.

Fingerprint: Also known as handprint, there are broad sense and narrow sense. Narrow sense: the mastoid pattern of the first finger palm; Broadly speaking, it includes fingers, knuckles and palm prints. There is a difference between fingerprints and fingerprints. Fingerprint is the mastoid pattern of the first palm of the finger, and fingerprint is the impression produced by mastoid pattern. In judicial practice, there is little difference between the concepts of fingerprint and fingerprint. Sweat glands and sebaceous glands exist in the skin of human fingers and palms. When life activities exist, sweat will be discharged, just like ink dripping on the printing surface of an atomic seal. Fingers and palms touch the surface of an object, just like an atomic seal. Of course, talk about the internal reasons why fingers and palms leave fingerprints. When other substances, such as grease and blood, are stuck on the fingers and palms, the principle of generating fingerprints is not much different from that of affixing ordinary seals.

Fingerprint forensics, search found. Search scope: crime center; The entrance and exit of the construction site and the surrounding area; Articles that may come into contact; All kinds of things that may be left behind. A function that is complex enough for authentication. It has the characteristics of uniqueness, heredity and invariance. It is not found that different people have the same fingerprints, and everyone's fingerprints are unique. Fingerprint is a unique symbol. For hundreds of years, the fingerprints left by criminals have become clues for pursuit. The computerized identification method makes the program appear faster and more accurate.

Everyone's genes are unique, so fingerprints are unique. The formation of fingerprints is influenced by both genetic factors and environmental factors.