Except there are limits to what constitutes Probable Cause. A cop still needs to demonstrate that there was reason to believe they had Probable Cause, and things like a person's skin color don't factor into it.

I threw the thing in about skin color not because I have any reason to believe you are racist, but because we are talking about cops, who in many areas have been shown to be quite racist, and have been shown to pull persons of color over far more than white people.