StyrbjornSterki said:Jon Jones's B sample also tested positive. Still no official word as to what substances they were but Dana White remarked that it was two different agents. From his demeanor I take it he knows what they were (but isn't telling) and that information left him certain that Jones in juiced.
from: http://www.mmafighting.com/2016/7/1...positive-for-estrogen-blockers-is-temporarily
Former UFC light heavyweight champion Jon Jones tested positive for Hydroxy-clomiphene, an anti-estrogenic agent, and Letrozole metabolite, an aromatase inhibitor, during a June 16 out-of-competition drug test administered by USADA, according to multiple reports.