[…] The chairperson of the group drafting the report on mental illness and assisted dying, Kwame McKenzie, made a statement to Canadian news media in support of current government policy that excludes competent people who suffer from refractory mental illness from access to assisted dying. He reportedly cautioned that ‘no one can be completely certain that a mentally ill patient is never going to get better’. Which takes me to the actual topic of this blogpost: certainty as a standard for health policy making. Complete certainty, if that were ever possible in the context of health and disease, where most decision making is based on probability as opposed to certainty, might be a defensible threshold if nobody were harmed by the implementation of such a high standard. If the setting of a high standard were cost neutral, there would be no good reason not to have such a standard.