Tests come back negative in Mich. search for Hoffa - Article Photos 1/4

FILE - In this Sept. 30, 1957, file photo Jimmy Hoffa, Teamsters vice president and leading candidate to succeed Dave Beck as the IBT's new president, waves to delegates at the opening of the Teamsters Union convention at Miami Beach, Fla. Hoffa’s mysterious disappearance, assumed death and myriad searches for his body have been the stuff of urban legends for more than three decades and continue with the most recent report that the former Teamsters chief’s remains are buried beneath a concrete driveway just north of Detroit. (AP Photo/File)