The cameras of the British police placed near and in the stadium were the Champions League-final in 2017was played failed at facial recognition for criminals.
The cameras had it 92% wrong, because of that many innocent people were arrested whom missed the match. The reason for this mistake was simple: the pictures of the database were made from bad quality and therefore vague for the system to recognise.
The simplest solution is to make pictures with a good quality of criminals.
Here you can read the story of The Guardian