Of course they are, but since it's a small boat, most of the time it's not in the water or even on the road, to be found. What would you have the plant operators do, just watch a potential kamikazi (Remember the Cole), just cruise right on in? The fact that this boat has been seen mulitiple times on mulitiple rivers, indicates that it is being moved on a trailer or somesuch, between incidents. Covered I'm sure.