Earning the trust of the United States Secret Service is no easy feat. But, in this video, you'll hear how "60 Minutes" correspondent Scott Pelley and producer Bill Owens convinced the agency to share its definitive research on the minds of assassins and school shooters.
As Pelley tells "60 Minutes Overtime" editor Ann Silvio, he and and Owens followed the research for more than a decade, producing several reports with rare interview footage of shooters and would-be assassins speaking from prisons and mental institutions across the country.
Within hours of the assassination attempt on Congresswoman Giffords, the authors of the Secret Service study were in touch with the "60 Minutes" team again. As details about alleged shooter Jared Loughner emerged, it appeared that his actions before the attack followed an all-too familiar path to violence.