“…These types of imagined and real situations of malfunctioning made it paramount for the biometric labs to continuously develop and test new and better systems and sensors, which could accommodate the reality of badly/ imprecisely positioned fingers, or even physically severed ones. As Bourne, Johnson and Lisle (2015) point out, it is in this "looping back of assumptions" about how biometric sensors work "in the wild", and the integration of this knowledge in the ongoing development of the technologies, that the tech developers often inadvertently become part of what we have elsewhere called the European 'border world' (Bourne, Johnson and Lisle, 2015: 309;Olwig et al, 2020): "[...] the sovereign decisions of bordering are made not only by border guards (using devices) at the moment of border crossing, but they are also disaggregated across time and space such that the multiple decisions made by scientists and engineers in their laboratories are also (and necessarily) constitutive of the 'sovereign decision' of the border". (Bourne, Johnson and Lisle, 2015: 309) Thus, researchers and tech developers work to ensure that the laboratory part of the assemblage of fingers, sensors, algorithms, software programs, hardware systems, designers, engineers, as well as ultimately particular border sites, border guards or other official users and a host of other elements, work as intended.…”