updated 1/12/2011 8:46:39 AM ET 2011-01-12T13:46:39

Assumptions about assassins are commonplace. They're loners, the myth goes. They're crazy, deranged, anarchists. However, a thorough study of assassins published by the Secret Service debunked many of these myths. Bill Dedman, msnbc.com investigative reporter, has written about this issue for more than a decade, and answered msnbc.com readers' questions.

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