I don't know much about this sort of shit, but if some PED has been found in his tests, surely they should know.
1. How much of it - That would denote whether it was ingested in the last few days (while he was in Russia) or not. if there is a lot , wouldn't it denote it had been in his system a longer period of time and meant he's been taking it regular. and
2. how long it has been in his system - again, pre-arriving in Russia or not.

with the benefit of Hindsight , surely now, people like Browne should canvass to have regular Drug testing in the build up to a fight. So then, before he leaves for Russia, he can be able to say "I've had a test and I'm Clean." then if he fails a drug test in Russia , it would be clear that it is a set up , because
a. he wouldn't be able to smuggle the drugs into Russia, and
b. even if he did, taking something so close to fight night would have no benefit .
I'm sure somebody on here would be able to put me right on this. (I'm not saying you're all a bunch of druggies btw! )