All one has to do is to look non-white. This is a little off the subject but the DEA had to check me out in front off all the other passengers as we were about to board a train. All my personal items were on display (nothing serious). The dog kept walking away from my bag because I didn’t have anything but the DEA kept pushing her back to my suitcase. Their explanation? “She is a lazy dog.” My response, “Why do you use her then?” This was all because the ticket agent at the window “decided” to save me more money by changing my reservation at the last minute. This was BEFORE 9/11.
All this is to say that it doesn’t take much.