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For the most part I agree with the author's thesis. Mr. Patrick stated it well in a previous article when he wrote that far too much effort is put into looking for things instead of threats.
However, I must take exception to the statements of the unidentified manager of the "mid-size regional airport." It comes as no surprise that TSA staff don't know the difference between SIDAs, sterile areas and secure areas because it is not their job to maintain the integrity of such. At the airport, TSA's only real function is to control access to boarding areas and to screen baggage. Maintaining the above mentioned security areas is the responsibility of the airport operator.