I recently took a trip to Houston and they were quite thorough at security at IAH. Can you set the wands for higher sensitivity? It went off on every tiny little piece of metal I had, and I got patted down in several places. Even the underwire in my bra went off and she had to feel it!?!? That has never happened to me before. I'm not complaining, it's for good reason, just surprised that it can be so different in different airports.