BIO 3303 earl washington case.pptx

BIO 3303 earl washington case.pptx - The Sad But True Case...

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The Sad But True Case of Earl Washington DNA Analysis and the Criminal Justice System by Justin F. Shaffer Department of Developmental and Cell Biology University of California, Irvine
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Learning Objectives Explain how PCR is used to amplify DNA molecules. Predict the size of a DNA molecule using gel electrophoresis. Explain how STRs are used in DNA profiling. Use DNA profiling results to match a suspect to a crime scene. Evaluate the use of DNA profiling methods in criminal investigations. 2
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On the evening of June 4, 1982, a white 19-year-old housewife named Rebecca Williams returned home to her Culpeper, Virginia, apartment with her three small children. She didn’t lock the door behind her. A strange man entered her apartment and attacked her, stabbing her repeatedly, dragging her to a bedroom and raping her, and then stabbing her again before leaving the scene. Williams staggered outside her apartment and neighbors and the police soon arrived. Before slipping into a coma and dying, Williams’ last words described the lone, black, bearded man who had attacked her. 3
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11 months later… On May 21, 1983, Earl Washington, a 22-year- old black man, was arrested in Warrenton, Virginia, on an unrelated case—burglary and malicious wounding. During two days of questioning by law enforcement officials from the Virginia State Police, Culpeper County, and Fauquier County, he confessed to the Williams murder (and to three other rapes). 4
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CQ1: Was Earl Washington guilty of raping and murdering Rebecca Williams? A. Yes B. No 5
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Questioning and testimony revealed that Washington… did not know that Williams was white. did not know the address of the apartment where she was killed. did not know that he had raped her. thought Williams was short when in fact she was 5'8” . said he had stabbed her two or three times when she actually had been stabbed thirty-eight times. said there was no one else in the apartment when it was known that Williams’ three children were in the apartment on the day of the crime. could not identify Williams’ apartment without police assistance. 6
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Why did Earl Washington say that he raped and killed Rebecca Williams? 7
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Why did Earl Washington say that he raped and killed Rebecca Williams?
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