This article examines a population-based opportunistic screening practice for cognitive impairment that takes place at a hospital in Sweden. At the hospital, there is a routine in place that stipulates that all patients over the age of 65 who are admitted to the ward will be offered testing for cognitive impairment, unless they have been tested within the last six months or have been diagnosed with any form of cognitive impairment. However, our analysis shows that this routine is not universally and mechanically applied. Rather, the health care professionals have developed and use an ethico-political judgment, concerning, for example, whom to test, when to offer the tests, and how to explain and perform them. This article explores the role and practice of this form of judgment, emphasising its political and ethical nature. The analysis is based on qualitative interviews with professionals and patients, and draws on the theories of Aristotle and Hannah Arendt.