Not sure what you mean by ripe.
There is always a possibility of being boarded, although in 20 tears of boat ownership I have yet to have it happen. Taking the boat does however pretty much eliminate the "roadblock/checkpoint" factor.
Just to clarify, if you are driving a boat, or rowing a boat or paddling a canoe, you are subject to the same DUI laws as anyone driving a car. All your state needs to do is realize the revenue that can be generated and the "inspections" will begin.
I hope that doesn't occure where you live like it has in Michigan.