In light of the many crises and catastrophes faced in the modern world, policymakers frequently make claims to be ‘following the science’ or being ‘governed by the data’. Yet, conflict based on inequalities continue to fuel dissatisfaction with the decisions and actions of authorities. Research into public security may require surveillance and covert observations, all of which are subject to major ethical challenges. Any neat distinction between covert and overt research is difficult to maintain given the variety of definitions used for all the terms addressed here. Covert research may be ethically justified and is not necessarily deceptive. In any case, deception may be ethical if engaged in for the ‘right’ reasons. Modern research sites and innovative research methods may enhance opportunities for covert work. In all surveillance and covert work, care must be taken about how consent is managed, how observed subjects are protected and harm to all involved minimised in all situations.