This problem can't be solved by writing any freaking law, it needs removing existing law. Law can't change people being racist or cops using too much force. Of course people are bias toward any other color of people then, it will change with time and proper law , policy and procedures. But the main reason playing role for fear is gun violence. Cops fear of getting shot , and fear will be lot less if cops know , there is a lot less chance of other guy having gun. This is not much of issue in other country where there is no gun rights. Take away gun right and take away gun from people it will go down slowly.

You can't have both ways, gun right and also non aggressive law enforcement.