(CNN)Tens of millions put their bags on a conveyor belt, walk through a metal detector, then head to their flights at American airports each year. But what happens when a Transportation Security Administration agent misses something in those seemingly routine checks? And, when they do, what does it say about how safe American travelers really are? Those are the kinds of questions being asked after a security scare effectively shut down parts of Miami International Airport, where a passenger went through security only to be chased down hours later. There ended up being no threat, though there were plenty of headaches, especially for those on the 50 flights delayed as a result. The Monday...
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