Years ago as a frequent MSP traveller, I was shown by an annoyed security guard how to get through the Xray gate to the Pier without setting the alarms off.
I used to wear cowboy boots, which had metal buckles, and these set the alarms off every day. So, yes, I do wonder how effective most security at airports is.
I mean do they honestly expect someone who has a disruptive intent to answer honestly !
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Continental Airlines
KLM Royal Dutch Airlines
NorthwestAirlines