Setting aside the philosophical items (which others are welcome to address), I still don't see anything wrong with the question the doctor asked you, which was limited to (as you related it in your post): "Do you do expert witness work in divorce cases?" If the doctor was "fishing" (and he did apparently end up talking with the lawyer) then that may be discussible, but I'm not willing to pass judgement on him or his motives without a lot more information from either him or the lawyer (unlikely, I suppose).

Thirty miles away can be pretty close in terms of mentioning potentially identifying information (though I'm not saying you did so).

Let's hear from other readers --

WHR