The latest search for the body of Jimmy Hoffa ended Tuesday just like all the others, with no sign of the missing Teamsters union boss – or anyone else, for that matter – in soil taken from a yard in a suburb of Detroit, Michigan, police said.
"Our department just received the soil sample report from Michigan State University, after a battery of tests; the samples submitted for examination showed no signs of human decomposition," said the Roseville Police Department in a statement.
With that, one of the most enduring, most intriguing unsolved mysteries of modern American life continues.
Hoffa was the long-time head of America’s biggest labor union and had known ties to mobsters and an openly tense relationship with government officials.
He disappeared July 30, 1975 at the age of 62 outside a restaurant in Oakland County, Michigan. He had planned to meet that day with a New Jersey Teamsters boss and a Detroit mafia captain.
In the 37 years since Hoffa’s disappearance, investigators have been unable to determine what happened to him. The case has been the topic of movies and books, and authorities have dug up at least three other properties in their search.
The dig beneath a driveway and shed in Roseville, Michigan began last week after a tip from an anonymous former gambler, who said he believed he saw someone being buried there around the time of Hoffa’s disappearance.
A former FBI special agent for Detroit said it made no sense that the Mafia would have buried Hoffa in broad daylight in a busy area.
"If this guy was standing there watching this, and it was Jimmy Hoffa, he would have been in the hole with him," Andy Arena told NBC News.