Border patrol around here takes the US/Canada border very seriously. We make Canadian jokes, and they may US jokes, because we share a lot of border up here, and plenty of it is water. I almost always see the Border Patrol at my local ramp.
This has been a big issue since prohibition. A lot of the multi-generation boating families on western Lake Erie, St. Clair and the Detroit River participated in the liberation of cases and cases of Canadian Club.