In the sense that the very presence and the practices of the uniformed TSA officers can in many cases deter dangerous materials on a plane, and the more simplistic "terrorists" (i.e., wannabe's, copycats, etc.), then what is there has to work to some degree. I don't know how anyone could dispute that.
Let me try to be clearer: the visibility helps.
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Really? That's not funny to you?
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