TSA

From the TSA's Evolution of Security blog:

At approximately 6:50 p.m. on March 29, 2009, a metal box alarmed the X-ray machine at Lambert-St. Louis International Airport, triggering the need for additional screening. Because the box contained a number of items including a large amount of cash, all of which needed to be removed to be properly screened, it was deemed more appropriate to continue the screening process in a private area. A Transportation Security Administration (TSA) employee and members of the St. Louis Airport Police Department can be heard on the audio recording. The tone and language used by the TSA employee was inappropriate. TSA holds its employees to the highest professional standards. TSA will continue to investigate this matter and take appropriate action.

Movements of large amounts of cash through the checkpoint may be investigated by law enforcement authorities if criminal activity is suspected. As a general rule, passengers are required to cooperate with the screening process. Cooperation may involve answering questions about their property, including why they are carrying a large sum of cash. A passenger who refuses to answer questions may be referred to appropriate authorities for further inquiry.

I don't think its right that they can ask why you've got a lot of money with you, and 'refer to appropriate authorities' if you refuse to tell them. Yet another example of Guilty Until Proven Innocent, I guess. I'd hoped that died with Bush's departure.