Let's talk about fingerprints.
Fingerprints are considered permanent and no two fingerprints are the same. In fact, at the 12th week of gestation, the fingerprint ridges
Fingerprints are the primary source of a person's identification (if available) used by law enforcement, forensic personnel, and medico-legal investigators. Although in the last 20 years, fingerprint evidence is being challenged more frequently, fingerprint evidence is still considered a reliable source.
There are two types of fingerprints: latent fingerprints and inked (known) fingerprint. Latent fingerprints are developed on an object at a crime scene. These are the prints that are usually seen being lifted in crime scene shows. Inked fingerprints are taken by inking fingers of an individual and placing these impressions on a fingerprint card (or scanning these impressions via Live Scan).
Fingerprints have friction skin present on the palm side (palmar) of the hands and on the bottom (plantar) of the feet. Friction skin contains ridges and valleys, and when combined make up the four basic fingerprint patterns: loops, arches, and whorls (L.A.W.).
Latent prints are discovered at the scene by dusting with fingerprint powder. There are many different types of power which can be used on specific surfaces. The powder is 'dusted' onto the object with a soft brush.
To see it done in action, please view the video below: