Study on Efficiency of Alternate Light Source for Detection of Latent Fingerprints

Abstract

Fingerprint is defined as the raised ridges, which form accidentally during the development of the foetus, that cover the whole of the inner surface of the hand and the underside of the soles of the feet. The images of the ridges form a fingerprint. Fingerprints are unique and are still considered to be the best form of personal identification for criminal investigation purposes. They help in proving the presence or absence of a person at a crime scene. Fingerprints found at crime scenes can be categorized by some examiners as patent, plastic or latent impressions. A latent finger mark is an invisible print which needs to be developed to make it visible and they are the most common form of fingerprint evidence. Latent fingerprints are a hidden record on materials formed by perspiration and oil from the internal finger the form of ridges and furrows during friction or contact. Three primary glands contribute to the production of sweat: The sudoriferous glands (eccrine and apocrine) and the sebaceous glands. Latent print can be found on different surfaces classified as porous, non-porous, semi-porous and textured surfaces.