Define "proven". There is no moral or ethical reason for the "court" of public opinion to use the same standard of proof as a court of law. Especially the criminal standard of proof. Remember, for example, that in criminal cases the jury is not allowed to consider past behavior -- even things the accused was convicted of beyond a reasonable doubt. Now, I think that's totally appropriate -- when the state is trying to put someone beyond bars he should only be on trial for that act. But for some member of the public trying to decide to be around the accused in any way? Hell yeah, I'm going to take past behavior into account, and so will you.
Anyhow, just the factual stuff (police reports, court case records, etc.) is enough that I'd never hire Brown for anything or want him around me or any employees/co-workers.