The out of place doctrine can be common sense, and it can be abused. If you have a car full of young white males driving through the worst part of town where there are known crack dealers working the corners, it is reasonable to suspect something is up if the car is slowing down at every intersection as if they are looking for a crack dealer.
What does this have to do with race?

A car slowing down at each intersection in a neighborhood where drugs are sold should be pulled over based on
those facts, not on being "in an area where another race predominates."