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>..but want to make London safer.

It would be nice to be safer from police harassment.

That old Sinéad O'Connor is still ringing true https://www.youtube.com/watch?v=n14lwdpYkAA

> ..but want to make London safer.

By the police stopping you, taking your picture, and trying to match your face to a list of criminals with 96% of false positive match rate.

Hmm, it's not like they go "positive match, right bake 'em away toys". The officer will analyse the match and on their confirmation that match means there's reasonable cause to question you, ask for ID, or whatever.

I wonder if there should be reasonable cause to take a photo and match it first?

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