Violent crime
Organisers say focus on criminality is "stifling" the world-famous street festival.
The detection system is part of a host of security measures.
The company said it was "unacceptable" for its adverts to appear alongside videos linked to violent crime.
Birmingham residents believe police cuts and a rise in violent crime are linked.
'They describe stabbings with... great joy and excitement.'
Online exposure to violence is also on the rise.
'I'm sure it's had an impact.'
Four people, including two children, were shot over the weekend.
I was lucky I had adults around me who were quick to notice that without any intervention I could quickly turn into another victim
Home Secretary Amber Rudd’s has unveiled her Serious Violent Crime Strategy, following the recent spike in murders, but will it work?