Showing ID at the Airport

This is an interesting article. It says that the "law" that requires passengers to show a photo ID to get on a plane is actually a secret order. It seems very strange to me that you need to hide that type of regulation for the public. What the hell was the Bush Administration thinking?

http://news.com.com/Airport+ID+checks+legally+enforced/2100-7348_3-5987820.html?tag=nefd.top