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John Jeffreys Case

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Dr. Alec John Jeffreys is a British geneticist who developed techniques for DNA fingerprinting and DNA profiling that are now used worldwide by investigators to bring justice to perpetrators as well as to resolve paternity and immigration disputes.
After finishing his doctorate, he moved to the University of Amsterdam, where he worked on mammalian genes as a researcher, and then to the University of Leicester in 1977, where in 1984 he discovered a method of showing variations between people's DNA, formulating and developing genetic fingerprinting. Jeffreys says he had an “eureka moment” in his lab in Leicester after looking at the x-ray film image of a DNA experiment on 10 September 1984, which surprisingly showed similarities and differences …show more content…
The Conversation turned to Pitchfork, and Kelly confessed that he had impersonated him, to take the blood test for him. Kelly explained that Pitchfork had asked for this favor because, he had already taken the test, for a friend who had been to jail for indecent exposure. Pitchfork had altered his passport, inserting Kelly’s photograph, and then driving him to the testing center at the school, waiting outside while the blood sample was taken.
Six weeks later, one of the people in the bar told a local policeman about the conversation. Kelly was arrested, and by the end of the day Pitchfork was also in custody. Pitchfork gave a detailed confession about both murders and two other sexual assaults. DNA testing confirmed him as the double killer. The following January, Pitchfork appeared in court, where he pleaded guilty to two counts of murder, two counts of rape, two counts of indecent assault and one count of conspiring to pervert the course of justice. He was sentenced to life …show more content…
The most commonly used markers are now variable microsatellites, also known as short tandem repeats (STRs), which Jeffreys first exploited in 1990 in the Mengele case. STR profiling was further refined by a team of scientists led by Peter Gill at the Forensic Science Service in the 1990s, allowing the launch of the UK National DNA Database (NDNAD) in 1995. With highly automated and sophisticated equipment, modern-day DNA profiling can process hundreds of samples each

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