Despite the tireless work of crime investigators, and the wealth of modern forensic techniques available to them, a disturbing number of crimes remain unsolved. This book explores some of the most famous open cases. Jimmy Hoffa, president of the Teamster's Union, disappeared in 1975. Although a number of suspects have been named and the influence of the Mob alleged, no one has ever been charged with his murder, and his body has never been found. The mystery of the "Black Dahlia" murder in 1947 provoked widespread speculation, and even the naming of the probable murderer, but he was found dead before the investigation could proceed. The "Zodiac" killer, who rocked San Francisco with the murder of more than 40 innocent people between 1966 and 1973, may still be at large. So why are these cases unsolved? Often it's because the culprit cannot be identified----or, if identified, cannot be traced----or because the evidence is insufficient to bring the case to trial. Chillingly, most of these cases involve murder or suspected murder. Each title in this series contains a foreword from the Chairman of the National Law Enforcement Association, color photos throughout, charts, and back matter including: an index, chronology, and further reading lists for books and internet resources. Key Icons appear throughout the books in this series in an effort to encourage library readers to build knowledge, gain awareness, explore possibilities and expand their viewpoints through our content rich non-fiction books. Key Icons in this series are as follows: Words to Understand are shown at the front of each chapter with definitions. These words are set in boldfaced type in that chapter, so that readers are able to reference back to the definitions--building their vocabulary and enhancing their reading comprehension. Sidebars are highlighted graphics with content rich material within that allows readers to build knowledge and broaden their perspectives by weaving together additional information to provide realistic and holistic perspectives. Text-Dependent Questions are placed at the end of each chapter. They challenge the reader's comprehension of the chapter they have just read, while sending the reader back to the text for more careful attention to the evidence presented there. Research Projects are provided at the end of each chapter as well and provide readers with suggestions for projects that encourage deeper research and analysis. And a Series Glossary of Key Terms is included in the back matter containing terminology used throughout the series. Words found here broaden the reader's knowledge and understanding of terms used in this field."
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