It is cute to point out the guys getting busted for searching for arrowheads, but upwards of 85% of the people in prison in the US are black or hispanic. I'd guess that an even larger percentage are poor. This process is not without a target.
A criminal defense lawyer once told me that he was convinced that certain police officers had a personal mission to make sure that every black boy in certain neighborhoods has a criminal record by the time he is an adult.