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Old 03-24-2017, 04:19 PM   #2
RogerBW
 
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Join Date: Sep 2008
Location: near London, UK
Default Re: New Technique of the Week: Follow Closely (Dancing)

Quote:
Originally Posted by johndallman View Post
I've encountered security doors, such as the ones at the Old Bailey, which make this trick impractical. They're very sturdy vertical transparent plastic cylinders, only big enough for one person (and not a Very Fat one). They have a door on each side. You go in, the door shuts, and the metal detectors, explosive sniffers and so on do their work. You only get let through if they're happy.
The original idea of these was to stop people casually letting others through that they were aware of, which happens distressingly often even in supposedly secure facilities. The sniffers and things came later.

They have a similar system at a large Internet site in London. The way to get round it is to be carrying bulky equipment, at which point you're ushered through the side door.
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