Police drill through the concrete of a shed to obtain a soil sample that will be tested for signs of human decomposition at a site where a tipster reported that the body of Jimmy Hoffa may be buried September 28, 2012 in Roseville, Michigan.

Officials carry a soil sample that will be tested for signs of human decomposition after police drilled through a concrete driveway where a tipster reported that the body of Jimmy Hoffa may be buried September 28, 2012 in Roseville, Michigan.

Officials carry a soil sample that will be tested for signs of human decomposition after police drilled through a concrete driveway where a tipster reported that the body of Jimmy Hoffa may be buried September 28, 2012 in Roseville, Michigan.

An officer carries a soil sample that will be tested for signs of human decomposition to a police van after police drilled through a concrete driveway where a tipster reported that the body of Jimmy Hoffa may be buried in MI, Sept. 28, 2012.

Roseville Police Officer Andrew Berger puts crime scene tape across the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan.

Roseville police officer Andrew Berger (L) talks with the owner (R) of the home at the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan.

Crime scene tape marks off the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan.

Police cars sit near the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan.

Milford Baking Company's Hoffa hand cupcakes lie on display May 24, 2006 in Milford, Michigan. The FBI received a tip that Jimmy Hoffa was buried on a nearby Milford farm, where they have been searching for nearly a week.

A banquet center sign shows a funny message May 24, 2006 in Milford, Michigan. The FBI received a tip that the former Teamster's president Jimmy Hoffa was buried at the Milford farm, where they have been searching for nearly a week.

Demolition workers tear down a horse barn for the FBI during the search for former Teamster's Union president Jimmy Hoffa's body at the Hidden Dreams Horse Farm May 24, 2006 in Milford, Michigan.

Demolition workers tear down a horse barn for the FBI during the search for former Teamster's Union president Jimmy Hoffa's body at the Hidden Dreams Horse Farm May 24, 2006 in Milford, Michigan.

FBI agents man a check point at the entrance to horse the Hidden Dreams Horse Farm May 24, 2006 in Milford, Michigan. The FBI received a tip that the former Teamster's president Jimmy Hoffa was buried at the Milford farm.

Demolition workers tear down a horse barn for the FBI during the search for former Teamster's Union president Jimmy Hoffa's body at the Hidden Dreams Horse Farm May 24, 2006 in Milford, Michigan.

A new book written by Charles Brandt states that a now deceased local Teamsters president from Delaware, Frank 'The Irishman' Sheeran, pulled the trigger and killed Hoffa in the foyer just inside the front doorway of this house in northwest Detroit.

A new book written by Charles Brandt states that a now deceased local Teamsters president from Delaware, Frank 'The Irishman' Sheeran, pulled the trigger and killed Hoffa in the foyer just inside the front doorway of this house in northwest Detroit.