The police in Tenaha, Texas have apparently been shaking down people, often motorists who are persons of color, as a regular way of doing business. I had thought that such crimes were limited to some small jurisdictions such as Tenaha, but am hearing that the same thing goes on in large cities as well. I only know of it in certain counties in California (Alameda, Amador, Humboldt, Sacramento). How widespread a problem is it?