page_title: Murder of Joanna Yeates
section_title: DNA tests
hierarchical_section_title: Murder of Joanna Yeates / Investigation / DNA tests
caption_attribution_description: Horfield Prison, Bristol
context_page_description: Joanna Clare Yeates was a landscape architect from Hampshire, England, who went missing from the flat she shared with her partner, in a large house in Bristol, on 17 December 2010 after an evening out with colleagues. Following a highly publicised appeal for information on her whereabouts and intensive police enquiries, her body was discovered on 25 December 2010 in Failand, North Somerset. A post-mortem examination determined that she had been strangled.
  The murder inquiry was one of the largest police investigations ever undertaken in the Bristol area. The case dominated news coverage in the United Kingdom around the Christmas period as Yeates's family sought assistance from the public through social networking services and press conferences. Rewards amounting to £60,000 were offered for information leading to those responsible for Yeates's death. The police initially suspected and arrested Christopher Jefferies, Yeates's landlord, who lived in another flat in the same building. He was subsequently released without charge, but was vilified in the press.
  Vincent Tabak, a 32-year-old Dutch engineer and the occupant of a third flat in the building, was arrested on 20 January 2011.
context_section_description: DNA tests were carried out by LGC Forensics, a private company which undertakes forensic analysis for criminal investigations. Lindsey Lennen, a body fluids and DNA specialist member of the team that analysed DNA samples from Yeates's body, said that although DNA swabs matched Tabak, they were not of sufficient quality to be evaluated. The team deployed a method known as DNA SenCE, which enhances unusable DNA samples through purification and concentration: "We couldn't say whether the DNA was from saliva, or semen, or even touch. But we could say that the probability of it not being a match with Tabak was less than one in a billion."
caption: Bristol Prison: Vincent Tabak was moved from this prison for his safety.[99]
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