LACOLLE, Que.—Along the busiest spot for clandestine migrants of the 9,000-kilometre border between Canada and the United States, every approaching set of headlights causes a flicker of doubt.
There is suspicion in a car idling on the side of a dark country road, and a driver at a four-way stop who suddenly activates the turn indicator at the sight of an approaching vehicle, but cedes the right of way.
Or the very sight of a minivan.
