I know a Canadian who was deported 3 weeks ago, got caught flying back and forth between SF and Vancouver. Same process, put in a holding cell, 17 hours later shackled and escorted to a air canada flight, DHS person waited at the front of the plane till the door was closed.
Not sure the Americans can be much more explicit these days, they want their processes followed and they're not tolerating skirting them, Canadian, British or anyone.