Brandon Rios failed drug test after match with Pacquiao

Coming from ESPN, Brando Rios failed his post fight drug test, carried out by the Voluntary Anti-Doping Association (VADA). Rios agreed to the procedure after his fight with Manny Pacquiao on Nov. 23 in Macau.
The drug test failure was even blamed on his conditioning coach Alex Ariza, who happened to be Pacquiao's former.

Rios was found positive for the banned stimulant methylhexaneamine, a drug that is generally used as a dietary supply but also a performance-enhancing drug.

VADA through its head Dr. Margaret Goodman, told ESPN on Friday:

Mr. Rios did not successfully complete the VADA program

Top Rank promoter Bob Arum has these words:

I can say unequivocally that it was not a steroid-related substance

It was some substance that was like a minor kind of thing that you're not supposed to take, something you take for weight loss, like a diuretic. They say it's not a steroid but it was something you should not have in your urine after a fight. So it went to the [Macau] commission that was in charge of the fight, and they gave him a suspension. He is allowed to appeal.

Apparently, Arum is blaming Ariza over Rios' failed drug test.

Brandon had the genius, Ariza, trying to help him make weight

It is not the fighter's fault. It's the people who are conditioning him. He's following orders on what to eat and drink, so I don't blame him. Brandon's not a nutritionist. It's generally the conditioner's fault if the kid doesn't make weight. This is Ariza's fault.

The fighter, in my experience, follows religiously what he is told to eat and drink. If he's being advised by people who consider themselves experts, but who really don't know s---, that's when you get in trouble.

When asked whether he was surprised with the drug test results for Rios, Ariza did not answer. However, he told ESPN - "We disclosed everything we were taking".