Everyone has heard about the monstrosities committed by US military personnel in the Abu Graib prison in Iraq, hell, it's been all over the media. I can imagine that those in power don't want those things leaked to the public, because it'll force them to dedicate time and money to clearing up the mess, or coming up with even more shocking material to divert attention (Nicholas Berg video, anyone?).
One of the ways they can accomplish such control over media is to control and limit the freedom of non-US journalists that visit the USA. Here is one such story (dated May 3rd 2004), and believe me, it'll make cold shivers run down your spine.
Welcome to America - When writer Elena Lappin flew to LA, she dreamed of a sunkissed, laid-back city. But that was before airport officials decided to detain her as a threat to security ...
Related links : IFEX (International Freedom of Expression eXchange) - Indymedia (Independent Media Center)

::ashamed::
My country keeps getting uglier. I'm sorry.
Don't be sorry, I don't generalize although it's often hard to imagine how come the government can get away with so much without noticeable ractions/opposition?