Exactly, there is nothing aside from him being so freakishly effective at his age to actually suggest he's on anything.

To use his punch output as evidence is especially ridiculous imo. He threw more punches against a plodding dope in Tavoris Cloud than he did years ago against Jermain Taylor.... So what? Who on earth wouldn't? Great case work as usual from detective Ross Taylor was faster than him, it really isn't that complicated. Those fights we all saw him throw very few meaningful shots per round compared to most of his recent wins around that time as well. The only time there was ever a striking physical change in Hopkins was after losing to Taylor and moving up to 175 in the first place. And guess what, even then he didn't throw much because Tarver had quick hands.

Now of course you can never rule anyone out in this day and age, but the fact is Hopkins is as skillful and meticulous as anyone out there and he wins fights on account of it.