Oh look, people are being advised to not even take their phones when they try to cross to the US from Canada
If the person being questioned withdraws and walks away, that is currently legal. However, McDermott says, a new Canadian law, which gives U.S. officers more power during preclearance procedures, will change that. Bill C-23 was passed in December and is expected to come into effect soon.
“With the new law, as soon as you want to withdraw form the preclearance area, it actually allows the American border officials to start a whole new line of interrogation. They’re allowed to identify you, they get to question you for as long as they want until they are satisfied as to your reason for leaving that area. So we will be updating the handbook within the next month whenever that law comes into effect.”