I heard it's not so much the lawyers, as their malpractice insurers. Many policies forbid Doctors from practicing medicine outside of medical facilities, with the consequence of immediate revocation even in life saving circumstances.
And why do you suppose the insurers made this decision?
I work in healthcare...half, if not more, of the decisions made are based on fear of a lawsuit. In fact, you hear that said constantly, "Yeah, I know we don't have the finances right now, but it'd cost a lot more to lose a lawsuit." In some cases, it puts Management over the edge in making a decision we all know is for everyone's benefit, especially the patient. In a lot of other cases, the "risk" being eliminated is minuscule, at best.