No, we don't know for certain if he is telling the truth, and I think it's ok to be here and disagree once in the while, give different opinions and things... (I think we have to maintain respect while doing it, though)
I think Steven has obvious dignity as well as integrity, he is a sensei and a buddhist for goodness sake, I personally think that these things say a lot about his character, and I also tend to think that from what I see, lies never seem to hold up much in court...
If he were lying, I think they would know it...
Could they put all these people in jail with no proof?
Somehow, I just don't think so...