That's interesting, because every Canadian airport that I've been to (and admittedly I've been mainly to the larger ones) has had an electronic mat that you sta

That's interesting, because every Canadian airport that I've been to (and admittedly I've been mainly to the larger ones) has had an electronic mat that you stand on that lights up a sign with an arrow to the left or right, telling you whether you should go to the standard metal detectors or the millimeter wave scanners (or a patdown if you so choose). The idea presumably being that when a machine is choosing, it leaves no room for profiling. I've never seen those in any American airport I've been to.