The UFC is moving on from the United States Anti-Doping Agency and is creating its own drug-testing program in a feud that involves former champion Conor McGregor. The mixed martial arts organization also sent a legal letter to USADA to demand a retraction and apology for a statement it issued Wednesday regarding the end of its deal with the UFC. In a statement to The Associated Press, USADA CEO Travis Tygart said, “We stand by our statement and our credibility.”