Federal air marshals are supposed to blend in with passengers on planes, but an alleged run-in with a Twitter-happy celebrity is highlighting how technology could blow their cover in an instant.http://feeds.feedburner.com/~ff/rss/...?d=yIl2AUoC8zA http://feeds.feedburner.com/~ff/rss/...?d=7Q72WNTAKBA http://feeds.feedburner.com/~ff/rss/...fk:V_sGLiPBpWU http://feeds.feedburner.com/~ff/rss/...?d=qj6IDK7rITs http://feeds.feedburner.com/~ff/rss/...fk:gIN9vFwOqvQ
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