DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Two pieces of bloodstained cloth and a vaginal swab from which a DNA fingerprint was obtained in the investigation of a rape case. DNA taken from such samples can be used to produce a pattern of DNA bands - the DNA fingerprint - that is unique to an individual. If a suspect's DNA fingerprint, obtained from his blood sample, matches the DNA fingerprint obtained from a bloodstain at the scene of a rape, or from the semen found on a vaginal swab, his connection with the victim is proved beyond doubt. DNA fingerprinting technique discovered in 1984 by Prof. Alec Jeffreys of Leicester University.
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