You don't know what a pain in the ass this is. CES '03 Peter Qvortrup wanted to bring samples of AN's new copper jacketed caps. He couldn't get them through security at Heathrow, and they spent the show in a locker in the airport.
This year, he had packed a very high zoot stepup transformer in his luggage. The security boys pried the case open, broke open the solder seal on one of the transformers and mashed it all back together, leaving a note, "your baggage has been opened by US Customs." No sh*t, sherlock!