The basic concept is that when a ranger is out, not even when he's paid, he is acknowledging that fact, that he's providing observation. He's providing sovereignty just by wearing his hoodie, being out there and observing any unusual activities. That's been the premise of the ranger program right from its inception.
If they see or are aware of any suspicious activity, they would report it and it would come through the appropriate operations centre, and then an appropriate response would be done.