Financial documents show Essex Police budgeted for purchasing IMSI catchers, devices that can indiscriminately sweep up texts, calls and other mobile phone data in a given area, and suggest it shares the technology with Kent Police reports Vice/Motherboard. Eric King, a Visiting Lecturer in Surveillance Law at Queen Mary University of London (QMUL), explains: "These documents suggest that a far wider group of police forces are making use of the technologies and it is no longer just the counter-terrorism units in the larger forces.”