9/11 Changed Everything

...in the sense that cops can now do any damn thing they want. Cf., from Schnier on Security (link):

London Heathrow security stopped someone from boarding a plane for wearing a Transformers T-shirt showing a cartoon gun.

and from BoingBoing (link, with cool video):

A BB reader says: "A local news crew was interviewing an Amtrak spokesman at D.C.'s union station who told the reporter that photography is allowed in the station. During the interview, a security guard interrupted them to say that photography/video was not allowed.