The following is a tweet from The Daily Yomiuri:
“Text messages implying match-fixing were found on #sumo wrestlers’ cell phones seized by Tokyo police in July, sources reveal. #Japan”
In 2005, “Freakonomics” demonstrated the existence of cheating among sumo wrestlers relying on a statistical analysis.
Freakonomics does not use ordinary economic theories. It is a statistical analysis of social problems.
Was there some heavy betting going on at the time? Or were other, weightier problems being investigated?
Nice one sanne 
There was a baseball-betting scandal among sumo wrestlers last year.
“The Metropolitan Police Department (MPD)'s organized crime division arrested three former sumo wrestlers and a woman on Jan. 26 on suspicion of involvement in a baseball-betting scandal that shook the sumo world to its foundations last year.” http://bit.ly/euBhPz
In the process of the investigation evidence was found that shows there had been cheating or match-fixing among sumo wrestlers.
Freakonomics: A Rogue Economist Explores the Hidden Side of Everything http://wikisummaries.org/Freakonomics
From WikiSummaries