A few experiences.
Sea-Tac airport, circa 1980. I was going to pick up my sister from an international flight arriving from England. I had a shaved head, and could be mistaken for one of the guys trying to sell religious literature. The guards at the checkpoint would not let me through the checkpoint unless I could display a ticket. I explained that I was meeting my sister, to no avail. I went back to the ticket counter for the airline she was arriving on, got the attention of a clerk without waiting through the line, and was told to try again go to the gate. This time the guards let me through.
Sea-Tac airport, 1998 I take out my mini-maglight, with about a pound of keys, SAK, micra, and swiss-tech dangling from it, and start to put them in the basket as I walk through the detector. A nice lady guard takes me aside, and asks me to walk through the detector, as they have a new employee, and they want to see how he'll react. I load the material back into my pocket and walk through the detector. It doesn't go off.
Sea-Tac airport, 1999 A new two stage screening process is in place. I hand the mini-maglight and associated paraphernalia to the guard at the first detector and walk through. He gets very upset because I have breached the security system. He conveys to me by screaming that I have to carry everything through his checkpoint. So I go back out, take my items, and go through his monitor again, setting off the alarm. Then he directs me to another guard, presumably more intelligent and able to handle the tough decisions, for the second stage. I hand this guard my metal, walk through a second detector, retrieve my belongings, and go on my way.
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Howard Wallace
Khukuri FAQ