1) What are the gendered, sexed, and racialized dimensions of the technological governance practices and devices mobilized to control transnational mobilities? 2) How do new technologies of control contribute to the maintenance of social inequalities? Securing mobility relies on security actors and security technologies to effectively control borders. Despite claims to eliminate gender or race bias through a supposedly neutral apprehension of the body by security technologies such as biometric data, these are “fundamentally shaped by, and generally exacerbate, the racial, ethnic, gender and other inequalities prevalent in society.” The complex relationship between the body and the technologies that dematerialize it can be seen in the contradiction of meanings when the “biometric body” of a person’s passport does not correspond to the “body presented” to the customs officer. Documenting the differentiated effects of the use of security technologies makes it possible to understand and make visible the forms of insecurity experienced by different population groups at cross-border crossings, including children, trans or queer people.