Jimmy Hoffa search likely to continue after concrete shows little

After digging up a Detroit driveway today, it appears the search for Jimmy Hoffa will continue.

Police Chief James Berlin told CNN that the search produced no “discernible remains.”

An anonymous source – a man said to be dying from cancer – told police he witnessed someone burying a body at the site 37 years ago, roughly around the time the Teamsters union boss went missing.

Police removed soil samples from under a Detroit-area home’s shed and sent them to Michigan State University for testing, CNN said.

“It would be great if it was, because I would like to bring closure to his family and the tens of thousands of Teamsters that idolize this man, and just the southeast of Michigan,” Berlin said on CNN.

“This is kind of like an open wound that won't go away.”

More from GlobalPost: Jimmy Hoffa search moves to Detroit driveway thanks to tip-off

MSU will examine them further and could have results on Monday, The Associated Press reported.

Berlin said they pulled "clay and mud" from the ground six feet under the shed, said USA Today.

Hoffa walked a fine line with federal authorities and the Mafia.

He spent time in jail for jury tampering, but then President Richard Nixon commuted his sentence in 1971, Reuters reported.

Someone last saw him outside an Oakland County restaurant on July 30, 1975.

The AP said previous, fruitless searches for Hoffa have included a backyard pool (2003), floorboards of a Detroit home (2004) and soil of a horse farm (2006).

While police said before the search began the timeline didn’t add up, scans of the area showed anomalies under the soil.

More from GlobalPost: 7 mysterious disappearances that baffle police