I am surprised to see there has been
This Luton fan got a 12 month sentence
https://www.oufc.co.uk/news/2016/july/prison-sentence-for-flare-fan/
Details here of others with reported serious injuries.
http://www.professionalsecurity.co.uk/news/case-studies/football-flare-campaign/
Recent...
Why would you be taking a flare to football in the first place?
This feller would have wished they had caught this guy taking one to football.
http://www.independent.co.uk/news/uk/flare-kills-football-fan-at-world-cup-qualifying-match-1505057.html
I would consider any tool that can inflict injury a weapon and in current times, through terrorist activity a flare or firework can cause injury, have a look at this.
https://www.thesun.co.uk/news/3717023/juventus-turin-fanzone-explosions-real-madrid-champions-league-final-latest/
Here you go, perhaps you should read this, which states a prison sentence can be issued.
www.fsf.org.uk/assets/Smoke-Bombs-Flares-and-Fireworks-Factsheet-for-FSF.pdf
I agree with you about the weapons, the non existence of weapons at the Amex, but they do have a problem with certain fans as btnbelle points out.
May 2016 https://www.express.co.uk/news/uk/672573/Crystal-Palace-fans-kick-off-Covent-Garden-FA-Cup-Manchester-United
October 2016...