Still chasing yesterday's terrorists

Three years ago, while on a trip to the US shortly after the plot to blow up trans-Atlantic airliners using liquids, I wrote the following: I'm very nervous about being in the US. Maybe not for the reasons you think. You see, the state of security here in the US is such that you are always chasing yesterday's terrorists. The 9/11 hijackers used box cutters, so you cannot carry sharp objects onto