A fingerprint is an impression of the friction ridges found on the inner surface of a finger or a thumb.
- Ridge patterns and specific details in areas of fingerprints are all different and never repeated.
- Ridges develop on the fetus in their own form before.
- Ridges are the same throughout a person's whole life, unless permanent scarring occurs.
- Ridge patterns differ within limits for class.
- Identical twins do not have identical friction ridge structure.