I'm not a lawyer, but I would assume that you would potentially have liability if he, or someone he injured, decided to sue you. In our tort-infested legal system, a person can sue another, AND WIN, over just about anything. How do you think John Edwards can afford a multi-million dollar mansion and $1000 haircuts? It wasn't on his senate salary. Why do you think that there has been some grass-roots efforts to push tort reform?

I would say that if he's a good friend and you trust him, then you probably have nothing to worry about from him. If he injures another, who knows. Liabiliy is attached to just about everything you do. Just the way it is in the U.S, unfortunately.

Mike