This paper examines the relationship between states’ migration control policies and human trafficking in origin, transit and destination states. Using cross-sectional data on states’ visa policies for 192 states and indicators for human trafficking from the Global Patterns report by the United Nations Office on Drugs and Crime, the paper analyses feedback mechanisms between policies and trafficking. The empirical evidence suggests that, contrary to the pessimistic predictions of policy scholarship, the feedback is characterised by a virtuous mechanism. Firstly, the results show that, in line with expectations of security studies, states tighten visa policies in response to trafficking threats. Origin and transit states face a greater number of restrictions on travel. Similarly, destination states of trafficking impose tighter controls. Secondly, visa restrictions against origin and transit countries mitigate trafficking from and through these states. Finally, the paper demonstrates that the vicious effect whereby stricter policies exacerbate trafficking pertains mostly to destination states’ visa policies and to visas imposed at borders.