[alnorth]

This isn't officially confirmed by anyone, but a lot of high-profile people are confidently saying that Jon Jones tested positive for estrogen blockers. From what I read, that is basically a big flashing neon sign that he was on steroids, and he's probably not going to get away with a light 6 month suspension. USADA may even hold firm on the 2 years.

That shit is not in supplements, and would not be the kind of thing that might sneak into a batch in a machine that wasn't cleaned properly from a different supplement to taint a supplement. The only reason for a healthy young man in his 20's to take estrogen blockers is to restart his natural testosterone production after a cycle of steroids. So, Jon Jones probably has some creepy doctor or medical guy in his inner circle who convinced him that they can do short little cycles and dodge the tests, and USADA probably got lucky with a random test at the right time, where they missed the steroid but got the estrogen blocker, and where it would not have been positive a day or two later.