A new study has found that young black people in some parts of the UK are more than 30 times more likely than white youngsters to be subjected to random "stop and search" inspections by police.
Human rights advocates say that authorities encourage racial profiling. But now, there is a new mobile phone app to help those stopped report their experiences - and it has the backing of senior police officers.
Al Jazeera's Jessica Baldwin reports from London.
Source: Al Jazeera