Just so long as it is not prescribed or that the decision is not executed by anything BUT the will of the patient.
The trouble there would be, though, how we could keep an employee (official, doctor, or nurse) from just saying "screw it" and taking it upon themselves. Such would be difficult to prove no?
"I wasn't counting cards, I was cheating."
"Ugh. you give me hives."
"It's Tee-revor time!!!"