Hey James,
This should not be a problem. I passed with four GPS-devices that were not mine trough security control (I borrowed them for the mapping party). Just explain it, and they we'll examine it closely.
Btw, make sure you have something with you with the logo of the conference, to prove you attended it.
Grtz, Maarten
2011/8/9 James Hare messedrocker@gmail.com
.. but I do have a security related question. I brought a USB flash drive with me, ...
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