The Massachusetts Supreme Judicial Court ruled that thugs are not allowed to treat a black person's attempt to avoid them as a sign of awareness of guilt. It could just be a sign that person is afraid of being persecuted by bigoted thugs.

Whether the thugs in Boston actually practice racial profiling is a separate question. I don't know whether they do. However, the issue here is not what they do, but what a person has a rational reason to think they are likely to do.