FILE - In this Friday, May 28, 2004 file photo, television crews set up camp outside a house in northwest Detroit, where investigators looking into the 1975 disappearance of Teamsters b

 

              FILE - In this Friday, May 28, 2004 file photo, television crews set up camp outside a house in northwest Detroit, where investigators looking into the 1975 disappearance of Teamsters b
FILE - In this Friday, May 28, 2004 file photo, television crews set up camp outside a house in northwest Detroit, where investigators looking into the 1975 disappearance of Teamsters boss Jimmy Hoffa ripped up floor boards. The FBI has seen enough merit in a reputed Mafia captain's tip to once again break out the digging equipment to search for the remains of Hoffa, last seen alive before a lunch meeting with two mobsters nearly 40 years ago. Tony Zerilli told his lawyer that Hoffa was buried beneath a concrete slab in a barn in a field in suburban Detroit in 1975. (AP Photo/Carlos Osorio, File)