Head of State.
That said, Canada is so strict on DUIs that a friend of mine who pled nolo contendere as an ill-informed and ill-advised* 20-something-- 4 decades or more ago, found she would have to hire an attorney for significant $$$ and pursue a six-month or longer process to get past a denial of entrance to Canada. She wants to go with family, but this is going to make it difficult as she will also have to pay for a records search in the semi-rural police precinct that charged her 40+ years ago--since none of their much older records are digitized, but in storage (if they can retrieve them at all). But she's not a $$$$$ traveler. Nor is she a 34-count felon--nor a felon at all. 
*police did not even perform a breathalyzer but she was caught up in a roadside "check" and the passenger with her was inebriated, while she had had nothing to drink. I have no reason to disbelieve her and have never seen her drink alcohol as an observant Mormon.
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