I agree with the above poster who has had a bad time with Canadian immigration/customs. Whenever I drive alone from SEA to YVR for a quick weekend trip for fun they treat me with deep suspicion and usually search my car. One time they even took it apart and detained me for 2.5 hours!! Afterwards they put my car back together good as new and gave me a genuine apology for taking up so much of my time, which I appreciated. ^ I guess it's just a red flag to them that I tell them I live in Seattle but have California plates on my car and a California license.