that is what I said problems with usada.Ya Jeff Novitzky was on Rogan's podcast fairly recently and said they're working with him to get things sorted out. It's because of him dodging USADA. Jeff said just Nick being Nick, not necessarily guilty.
UFC's Jeff Novitzky optimistic Nick Diaz will fight again
http://mmajunkie.com/2018/01/nick-diaz-ufc-return-jeff-novitzy