I don't know about lawyers- I've never seen one. But I'm a doc, and my patients sometimes go see other doctors (if their insurance allows). I don't mind. Second opinion and all that. What's the worst that could happen? That the other doc is right and I'm wrong? I wouldn't be upset about that because my ultimate goal is that the patient gets the care they need. From me or my colleague, I don't care. Even if I was hurt (and I would not be), it is hardly an ethical violation on their part. They pay me money and if they have enough they can pay someone else too.