- DNA fingerprinting was invented by Sir Alec Jeffreys at the University of Leicester in 1984. - The technique was first used by police in 1986 to investigate the murders of two teenage girls, Lynda Mann (1983) and Dawn Ashworth (1986). - The DNA evidence from both murders was matched, and DNA analysis was used to prove the innocence of the initial suspect, Richard Buckland, and later, through a mass DNA screening, to identify the actual killer, Colin Pitchfork, who was convicted in 1987.