In the 19th century it was observed that contact between someone's hands and a surface left barely visible and marks called fingerprints. Fine powder (dusting) was used to make the marks more visible.
Dr.Henry faulds gave the idea of tracing criminals from latent prints found at a crime site and came to the conclusion that no two prints were alike.
The Galton-Henry system of fingerprint classification, was published in June 1900, and officially introduced at Scotland Yard in 1901. It is the most widely used method of fingerprinting to date.