This article discusses the anxiety potential of private security systems in relation to increasing social insecurity. It is based on a sociological study of the real experience of people working in private security. It highlights the real and potential effects of a new framework of constraints in terms of the weakening of the social link. While making agents more uncertain about their responsibility as part of their duties, contemporary security systems mobilize their subjectivities through new double binds, on increasingly controlled sites, according to behavioral norms dependent on economic and trade interests as much as the struggle against insecurity. Thus, private security guards and clients are engaged in a set of frequent and uncertain ordeals typical of societies of control.