Dr Monterosso said it was difficult to find statistics to show whether this method of proactive policing reduced crime.
In order for it to be plausible that it would reduce crime the police would need to be open about the fact that they are using this tactic. The only reason more than a handful of people actually know about this is the sound journalism by Mya Kordic
It may be legal but it is thoroughly immoral and one suspects if it was a white kid with wealthy parents it would've been chucked out.