This video discusses flaws in the shielding of U.S. "electronic" RFID-bearing passports.
If you are bored by this, advance the slider to 2:28, where you'll see a demonstration of this vulnerability, in the form of an exploding trash can that doesn't detonate until an American citizen (or an American dummy) slides past on a clothesline. I've heard this discussed, but this is the first time I've seen a graphic demonstration...
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Here's
a link directly to the good part.