Peter Watts is a traveller who was searched by U.S. Customs in the United States, just prior to crossing out of the United States, and Canada had nothing to do

Peter Watts is a traveller who was searched by U.S. Customs in the United States, just prior to crossing out of the United States, and Canada had nothing to do with it. All travellers exiting the U.S. are subject to exit inspections if desired by Customs. Or indeed, which is the subject of this thread, subject to search even if they have no intent of crossing any border and have never done so in their lives, as long as they are within 100 miles of the border.