When Canada’s Parliament in 2016 legalized the practice of euthanasia—Medical Assistance in Dying, or MAID, as it’s formally called—it launched an open-ended medical experiment. One day, administering a lethal injection to a patient was against the law; the next, it was as legitimate as a tonsillectomy, but often with less of a wait. MAID now accounts for about one in 20 deaths in Canada—more than Alzheimer’s and diabetes combined—surpassing countries where assisted dying has been legal for far longer.