Lance Pugmire of The LA Times has reported that Brock Lesnar tested positive for clomiphene. This is the same estrogen blocker that was found in Jon Jones' system during an out-of-competition test, leading to his removal from UFC 200.
I'm told by an official with knowledge of Brock Lesnar's positive test that the substance is clomiphene, the same one found in @JonnyBones.
— Lance Pugmire (@latimespugmire) July 19, 2016
The UFC released a statement on Friday announcing Lesnar's failed out of competition drug test.