The biggest problem with the Backscatter, etc imaging machines is that they take WAY too fucking long to clear people. You have to stand there for 7 seconds while it takes an image, then if you have ANYTHING they are unsure about, they want to do a pat down. I was in a hurry on Saturday at LAX, so I went through one - did not have time to ask for alternate screening -- and I had to go to secondary for my watch -- which was clearly visible on my arm since I had on short sleeves. The person watching the monitor communicates to the agent the area that needs to be looked at -- in this case, my left wrist - and then you wait until they decide to check it. So instead of being through in 5 seconds and gathering my bags, it took about 20 seconds, of course while bags are piling up since they now go through faster than people with this system.
15 seconds may not sound like much, but you multiply that per person standing in the average security line and it's going to create a huge bottleneck that will cause nothing but problems for everyone.
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