A recent legal case involving an ambiguous diagnosis in a woman with a severe disorder of consciousness raises pressing questions about treatment withdrawal in a time when much of what experts know about disorders of consciousness is undergoing revision and refinement. How much should diagnostic certainty about consciousness matter? For the judge who refused to allow withdrawal of artificial nutrition and hydration, it was dispositive. Rather than relying on substituted judgment or best interests to determine treatment decisions, he ruled that (...) withdrawal was categorically prohibited, even as he concluded that Hannah Capes was more likely than not in a permanent vegetative state. In many jurisdictions, his decision would likely be consistent with existing law. Evolving technological advances have demonstrated that biologically distinct diagnoses incorporated into state laws may be difficult to establish even under ideal conditions. We offer the Capes case for purposes of examining the consequences of enshrined legal distinctions between permanent vegetative state and other severe disorders of consciousness. Insistence on proof of the permanent absence of consciousness before treatment withdrawal is allowed fails to respect the rights of persons with disorders of consciousness. Even the well-established rights to treatment withdrawal for those in a permanent vegetative state may be in jeopardy if reform is not undertaken. (shrink)