Traffic police don't chase or shoot anyone. If you drive here frequently, sooner or later you will come across a proper checkpoint. Traffic cones, riflemen w/M16's, lots of National police presence. Be sure to stop, these guys mean business!
Unfortunately, most Haitians in the DR don't qualify as refugees, they have been arriving for years as economic immigrants. Perhaps a few of the most recent arrivals can be classified as refugees, but that is all.