OAKLAND TOWNSHIP, MI – JUNE 17: An FBI agent gathers up crime scene tape while moving the news media further away from a field outside Detroit where agents are searching for the alleged remains of former Teamsters union president Jimmy Hoffa June 17, 2013 in Oakland Township, Michigan. The agents were acting on a tip provided by Tony Zerilli, 85, a former mobster, who was released from prison in 2008. Hoffa, who had reported ties to organized crime, went missing in July of 1975. (Photo by Bill Pugliano/Getty Images)