From http://www.mcclatchydc.com/homepage/story/69268.html

"The U.S. military says it seizes and destroys photos of detainees, even those in which the captives pose for news photographers, under an interpretation of the Geneva Conventions that shields prisoners of war from public humiliation."

So:

Pictures of detainees cannot be taken to avoid public humiliation.

Pictures of detainees suffering private humiliation can be taken. Those pictures cannot be released.

Ladies, Gentlemen, and gentle readers of other persuasions: your system, working hard for you!

That's politics. You're welcome.