The story you cited was a jogger (female, by the way) who crossed via road in broad daylight in front of border patrol agents. There are no ground sensors or v

The story you cited was a jogger (female, by the way) who crossed via road in broad daylight in front of border patrol agents. There are no ground sensors or video cameras in the thousands of miles of border between roads and marked paths - the clearing is just there to tell you that you're at the border. If you're so inclined, you can hike away from border stations and cross between the US and Canada at your leisure.