Yes, it’s April Fool’s Day. However, Ken Shamrock and Kimbo Slice are indeed still scheduled for the main event of Bellator 138, June 20 in St Louis.

Still, some call the fight a freak show. They say the 51 year old Shamrock, who is best known for his wins in the original UFC shows of the 1990’s and a successful career as a pro wrestler, has no business being involved in MMA in 2015. They say the 42 year old Kimbo, who cut his teeth in unsanctioned fights on YouTube before a brief MMA career, has no business being involved in the sport at all.

But Missouri Office of Athletics is taking it seriously, according to a report from Marc Raimondi from MMA Fighting — ordering both athletes to go through a no-joke regimen of drug testing.

MOA Director Tim Luekenhoff told Raimondi that the “additional testing” which Kimbo and Shamrock will have to undergo will be similar to out-of-competition protocol for Nevada and California. It was not specified if this will include blood and urine, or urine alone. Raimondi notes that the two fighters will also need medical clearance to fight in Missouri.

Shamrock boasts a 28-15-2 record in the sport; having begun his career in 1993 with the Pancrase organization in Japan and continuing to fight as recently as 2010. In 2009, he tested positive for three anabolic steroids: norandrosterone, noretiocholanolone and stanozolol, following a win over Ross Clinton.

Kimbo, alias Kevin Ferguson, is 4-2 in MMA, having scored ratings successes for the UFC and Elite XC. He also has not fought in MMA since 2010.

The two were originally to meet in Elite XC in 2008, but an injury to Shamrock prevented the bout from coming to fruition.