"Biometrics measure the physical and behavioral characteristics of individuals and assigns a unique identity through automated methods. Physical characteristics include the anatomical components and physiological functioning of the human body, while behavioral characteristics describe the way an individual reacts or moves within the environment. Biometric systems can be classified according to the human characteristic being measured. These classifications are also known as biometric modalities. The modalities most commonly used in law enforcement are fingerprint and facial recognition. Public safety and emergency response agencies are rapidly implementing biometric systems to improve operations such as verifying inmate identities, investigating crime scenes, and maintaining security at sporting events and incident command posts. Among the many benefits biometric systems provide are enhanced safety for emergency responders and increased security of the nation's borders. This application note presents information on biometrics technology, standards and specifications, and databases, as well as discussions of current applications of the technology. It is intended to assist those seeking to implement this technology. The content in this document was gathered from October 2013 to April 2014 from Internet searches, industry publications, and interviews with subject matter experts."
Department of Homeland Security: https://www.dhs.gov/