ROSEVILLE, MICH.: Giants Stadium. A Florida swamp. Underneath a backyard pool in Michigan.

There are innumerable theories about where former Teamsters leader Jimmy Hoffa was buried years ago, but his remains have never turned up.

The latest tip has taken investigators to a concrete driveway behind a neat brick ranch-style home about four miles north of Detroit, where a man told police he thought he saw Hoffa buried about 35 years ago.

Soil samples will be taken today and sent to a forensic anthropologist at Michigan State University to test for human decomposition. Results are not expected before next week.

News of the search has brought attention to the mostly working- and middle-class suburb from both the curious and naysayers. Slowly moving vehicles have clogged the residential street as camera-wielding neighbors snapped photos for keepsakes.

I believe its him. My sister said it is, and shes a psychic, said Mike Smith after ambling up to the home Thursday and shying a bit from the yellow police tape stretched across the driveway.

Hoffa was last seen July 30, 1975, outside a restaurant in Oakland County, more than 30 miles to the west.

The mystery behind his disappearance has sparked numerous theories and rumors: that his remains were ground up and tossed into a Florida swamp, entombed beneath Giants Stadium in New Jersey or obliterated in a mob-owned fat-rendering plant.

Feisty and iron-willed in contract talks, Hoffa was an acquaintance of mobsters and adversary to federal officials. He spent time in prison for jury tampering.

The day he disappeared, Hoffa was supposed to meet with a New Jersey Teamsters boss and a Detroit Mafia captain. He was declared legally dead in 1982.

Previous tips led police to excavate soil in 2006 at a horse farm more than 100 miles north of Detroit, rip up floorboards at a Detroit home in 2004, and search beneath a backyard pool north of the city in 2003.