The Europol study is 1 of the most comprehensive analyses of the impact of drones, mobile robots and autonomous vehicles on public safety in Europe. Europol indicates that unmanned systems change both police operational tactics and the nature of crime, the structure of threats and the way officers are organised. Unmanned systems are now operating in 4 key domains: on the ground, in the air, underwater and in the digital environment, creating a new, multi-dimensional context for operations.