I think that the police should search anyone they genuinely believe may be involved in, or equipped for, crime. That, in my opinion, should be the only criterion.
Whether the suspect is Black, Asian, Oriental, Caucasian or Mixed should not make any difference - there actually are bad examples of each racial group present in society, and dealing with that should ignore their racial background & just focus on the effect of their behaviour, imo.
Of course, there are a vast majority of people who are good, whatever their racial background, and I hope they can continue to treat each other with mutual respect.
It would be a good thing if the Police were allowed to deal with things without the onus of 'performance monitoring', in my opinion, as I cannot help thinking this tends to encourage dealing with the symptoms, rather than the causes, of crime ???