The reading of my temperature as I entered the security screening line the other day prompted a remark: "you are one cool customer". I asked what the display read, the reply as "34 degrees". When I asked what the normal range should be, the AC-uniformed screener replied that she didn't know. This suggests a few possibilities: the device used rendered an inaccurate reading, the distance between gun and forehead was excessive, I'd just been submerged in icewater and/or the AC employee administering the test hadn't been adequately trained on the procedure. Any one of these, if true, reinforces the option that this step is unnecessary, ineffective and a waste of time & resources.