They don't have to detain you at all, they just have to deny you entry. Travel mode on? GTFO! In fact, this is already happening: http://www.dailyxtra.com/cana

They don't have to detain you at all, they just have to deny you entry. Travel mode on? GTFO! In fact, this is already happening: http://www.dailyxtra.com/canada/news-and-ideas/news/us-customs-block-canadian-man-reading-scruff-profile-215531 http://www.dailyxtra.com/canada/news-and-ideas/news/us-custo... > “They said, ‘Next time you come through, don’t have a cleared phone,’ and that was it. I wasn’t let through. Technological countermeasures don't seem to work. Sure, they work in the sense that they protect your data, but if the border guy doesn't like you, technology won't save you. You will be sent on your way.