The UFC and United States Anti-Doping Agency have made significant revisions to the promotion's anti-doping policy, according to Brett Okamoto of ESPN.
The promotion will now have a "UFC prohibited list" and a list of "certified supplements."
Additionally, an athlete who fails a test because of a contaminated supplement that's been certified by one of five independent supplement certifiers won't receive any discipline from UFC.
The changes intend to address the increased rate of drug cases involving contaminated substances.
This includes Nate Diaz, who failed a drug test before being cleared ahead of UFC 244.