"In legal parlance, that is called 'the rational person test,' ... That's where somebody else says, 'Even though we have no idea what this person would want in this circumstance in which they cannot themselves tell us what they want, a 'rational' person - meaning, myself - in that circumstance would want to die.' So you move very quickly from so-called voluntary euthanasia to involuntary euthanasia. These legal and medical developments are not simply hypothetical They're in the courts right now."