Recently, Mark Hunt, the mixed martial arts fighter that made it to FindLaw's Tarnished Twenty after threatening to personally sue his UFC opponents that cheat, has filed a lawsuit against Brock Lesnar and the whole UFC. Hunt is alleging that UFC and Lesnar conspired together, and not just that the league was simply negligent in not expediting Lesnar's drug tests.
Hunt, who lost his match against Lesnar last year, attempted to work out some sort of settlement with the UFC when it was discovered that Lesnar had used performance enhancing drugs and had failed two pre-fight drug tests. However, the UFC has been unwilling to compromise. In essence the UFC stated that since they have been lenient regarding their rules on PEDs in the past, Hunt had no expectation that UFC wouldn't be lenient in Lesnar's case.