Airport security
Notice how, over the past five years, American airport security has gotten systematically more invasive, more edgy, and more unpleasant? Well, apparently it still hasn't gotten
more effective to go with that. You can still transport as many bombs as you want aboard aircraft, just so long as they aren't hidden inside your shoe.
(Which, really, shouldn't surprise anyone. Fake security monitors objects and has lots of procedures; real security monitors
people. But that requires extensive training and may involve things like profiling, which are politically unpalatable. Even the best physical security screening of luggage doesn't really achieve anything, since there are plenty of other places you could smuggle things aboard. [Left as an exercise for the reader -- I can think of some really fun ones that they'll never be able to screen for without causing a riot])
