The U.S. Anti-Doping Agency, which partners with the UFC, has revised its anti-doping rules, addressing several issues that arose in high-profile cases. The changes, which go into effect April 1, make it easier for a new fighter – or one who’s been released – to return to the octagon, while making it more difficult for those coming out of retirement. “The policy updates announced today are a direct reflection of our experiences, and the feedback we’ve received – from both athletes and the UFC – all of which we believe will give further confidence to competitors that they can step into the Octagon, compete clean and win,” USADA spokesperson Ryan Madden told MMAjunkie in a prepared statement.