If the pushback is not successful, I would expect that enforcement would be strong, for a while. If you have never experienced one of these Saturday spectacles, it is hundreds of canoes, rafts and tubes coming down the river. The river is quite large in many places. I would think that it would require several officers on jet skis or something similar to be effective. I once came upon a couple of teams of officers, each team had 1 State of Michigan officer and 1 USFS officer. They were observing the activity on the river. We were hiking back to our camp from fishing; waders, vests ,rods. They never even asked to see our licenses. They asked if we had been harassed, I told them that while the tubers were drunk and stupid, we had never had a problem
I doubt that drift boat occupants would be usual targets, but the penalties are severe and I hold a teaching certificate so I won't risk it.