In 1986, a technique called “DNA fingerprinting” was used for the first time in a criminal investigation, when a geneticist named Alec Jeffreys realized that when DNA was extracted from cells and attached to photographic film, it developed as a sequence of bars that could uniquely identify someone. His accidental…
Source: Gizmodo – Dutch Police Are DNA Testing 21,500 Men to Solve a 20-Year-Old Murder