c. 2000 BCE Bodies function as practical identifiers Long before formal biometrics, communities recognize individuals by distinctive faces, voices, and marks. c. 500 BCE Babylonian and Persian administrative cultures note bodily marks Ancient legal and administrative systems sometimes rely on distinctive physical signs for recognition. c. 500 BCE Qin and Han practice encourages seals and hand marks East Asian documentary culture links bodily presence and official validation in durable ways. c. 500 BCE Finger marks appear in some East Asian contracts Handprints and fingerprints are used in parts of Asia to confirm identity on documents. 1686 Malpighi studies friction ridges Marcello Malpighi describes the ridged structure of fingertips, an important scientific step toward fingerprinting. 1788 Mayer notes uniqueness of fingerprints Johann Christoph Andreas Mayer argues that the arrangement of skin ridges is unique to each person. 1858 William Herschel uses handprints in colonial administration In India, Herschel begins using handprints and later fingerprints to reduce fraud in contracts. 1879 Bertillon system measures the criminal body Anthropometry offers one of the first modern state systems for identifying repeat offenders. 1880 Faulds proposes fingerprints for forensics Henry Faulds publishes arguments for using fingerprints in criminal identification. 1892 Galton systematizes fingerprint classification Francis Galton provides statistical and classificatory foundations for fingerprint identification. 1901 Scotland Yard adopts fingerprint identification Britain formalizes fingerprints in policing, accelerating global adoption. 1924 The FBI creates a centralized fingerprint file Large national archives make biometric identification scalable across jurisdictions. c. 1960 Automated fingerprint matching begins Computers start assisting the comparison of prints at a scale impossible by hand alone. 1985 DNA profiling adds a new biometric frontier Biometric identification expands beyond visible traits to molecular evidence. 1991 Iris recognition is patented Modern iris-recognition methods begin to move from research to applied identity systems. 1999 FBI launches IAFIS An integrated automated fingerprint system turns biometric search into near-instant national infrastructure. 2001 Post-9/11 security accelerates biometrics Airports, borders, and governments invest heavily in biometric identification systems. 2013 Fingerprint unlocking reaches mass smartphones Mobile devices make biometrics an everyday consumer interface rather than only a police tool. 2017 Face recognition enters mainstream phone design Consumer biometrics shifts toward cameras, machine vision, and passive authentication. c. 2020 Biometrics becomes a civil-liberties battleground Debates over facial recognition, bias, consent, and surveillance redefine the politics of biometric systems.