London cops are using an unregulated, 98% inaccurate facial recognition tech per Boing Boing

'The London Metropolitan Police use a facial recognition system whose alerts have a 98% false positive rate; people falsely identified by the system are stopped, questioned and treated with suspicion.' 

More on this reassuring news here at Boing Boing https://boingboing.net/2018/05/14/beijing-envy.html