I personally could never say he did for a fact. Even if he admitted he used steriods. It could be he just gives in to the pressure. Furthermore if Barry shot up right in front of me and told me he was shooting steriods, I could not say for a fact he was shooting up steroids. So there is a gray area between opinion and fact.

Sounds like a bunch of hooey but I confess to have problems with this being a science guy and understanding the problems of reconstructing events from diff. viewpoints. None of us where eyewitnesses to any of this so its hard to establish when something becomes a fact. And there are clearly diff. types of facts with diff. levels of certainty.