The Japan Sumo Association began random doping tests of wrestlers Wednesday, following a series of drug-related scandals that have damaged the image of the ancient sport.
Several top wrestlers, including grand champion Asashoryu of Mongolia, were subjected to urine tests by Mitsubishi Chemical Medience Corp., Japan's only institution certified by world anti-doping agency WADA. The results will be disclosed at a later date.
In January, second-division wrestler Wakakirin was arrested on suspicion of possessing marijuana, becoming the first Japanese wrestler to be arrested in a marijuana case and the latest to be thrown out of the sumo world.
Wakakirin was sentenced Wednesday to 10 months in prison, suspended for three years, after being arrested on suspicion of possessing marijuana in January.
Wakakirin will avoid serving time in prison as long as he doesn't commit any crimes during a period of three years.
His arrest came after three Russians were dismissed last year over marijuana charges.
New anti-doping rules were set by the JSA in late February so that all of the association's members could be tested without warning.
Cheating in Sumo Wrestling? Is nothing sacred in this world anymore?
And how is marijuana preformance-enhancing? Can a man slap another man harder when he's high?