It should be noted, though, that these dragnets are *incredibly* poor value for money, as the British Transport Police discovered after subjecting millions of travelers to facial recognition in train stations, without catching *a single suspect*:
www.theguardian.com/technology/2...
theguardian.com
Trial of live facial recognition in London stations leads to a false positive and no arrests
Freedom of information request finds six-month trial cost £320,000, used almost 100 police hours and led to just one – incorrect – alert