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Re:Chinese police use facial recognition tech to arrest susp... by arethuza on Friday April 13, 2018 @07:52AM (#16829066)
It has already been used once in the UK:

https://www.theguardian.com/uk-news/2017/aug/05/met-police-f...

I would suspect if there has already been one public announcement then it will actually have been used covertly for quite a while.

Re:Chinese police use facial recognition tech to arrest susp... by firmgently on Friday April 13, 2018 @11:45AM (#16831096)
Another one which got a bit of press was Download (music festival) in 2015: "A police force has defended scanning the faces of 90,000 festival-goers this weekend and checking them against a list of wanted criminals across Europe."

http://www.bbc.co.uk/news/uk-england-leicestershire-33132199