I dont agree with this. Chad Johnson is actually a very descent person. Never been in trouble. Spent almost all of last year sitting on the sideline and not once made any negative hay-way. Now, I am not saying I want him as a Steelers but I dont think he has any baggage. He's a clown no doubt but he is anything from being a problem child.
He has been known to lose his cool on the field and start yelling at his QB and/or play disinterestedly. I live in Cincinnati. He isn't a bad guy and he is a real professional who takes his job seriously. But, he is a bit of a head case as well who sometimes lets his emotions get the best of him (to the detriment of his team).
Even if Bill Belichick was getting an atomic wedgie, his face would look exactly the same.