ROSEVILLE, Mich. -

Authorities investigating a claim that the remains of missing Teamsters boss Jimmy Hoffa could be buried beneath a slab of concrete are awaiting results of soil samples taken from a Roseville backyard.

Forensic anthropologists were expected to test the samples for human decomposition and Roseville Police Chief James Berlin said the results are expected back Tuesday morning.

The samples were removed Friday after officials drilled through the floor of a shed north of Detroit. Berlin said the ground would be excavated if decomposition was found in the samples.

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Hoffa was last seen July 30, 1975, outside a restaurant in Oakland County, more than 30 miles to the west. The day he disappeared, Hoffa was supposed to meet with a New Jersey Teamsters boss and a Detroit mafia captain.

SLIDESHOW: Search begins for Jimmy Hoffa's remains in Roseville

Published On: Sep 28 2012 10:02:58 AM EDT

Michigan investigators began taking soil samples Friday from underneath a driveway in Roseville in the latest effort in a decades-long investigation to figure out where missing Teamsters boss Jimmy Hoffa may be buried.

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