We travel from NY to MI and back frequently, using the Lewiston/Queenston to Sarnia/Port Huron route across southern Ontario. Only once have we ever been stopped for a secondary inspection, and that was going into Canada from NY. The whole process took about 20 minutes, and they never even asked us to open the storage bays. On our last trip back to NY, I told the US officer that we had just passed through Canada on our way back from MI, and the only stop we made was to fix lunch and walk the dog. He immediately stopped talking to me, moved over to the window our dog was watching out of, and asked her. "And just what did you leave behind in Canada?" When I stopped laughing, I told him, "Honest, just a wet spot, sir." He laughed and handed me a small dog biscuit for her, telling us "Welcome back to the US!"