There are several old, and a few newer, threads regarding cruising through Canada if you are a U.S. citizen on an Alaska cruise, and you maybe had a DUI or other arrest when you were younger. The following is my experience from 3 days ago (Aug 5-12, 2022) on Royal Caribbean. For people not aware that this might be an issue, Canada has the right to establish their own laws and requirements for entry. Don't try to argue this. Yes, an old DUI might be considered a reason for Canada to deny entry