If your "friend" were to sub or unconsciously answer his questions in ways that he or she thinks might be viewed more favorably, then the dialog could not be clinically helpful. And as I believe this "friend" of yours might be motivated to seek a more favorable light in the doc's eyes, I think this is likely to happen.

It's not ethical. I would be shocked, knock me over with a feather, if it happened, and I think it's best left to the category of fantasy.

gg