Here's how TSOs create probable cause:
I don't believe money is contraband. I have never seen a TSA ruling otherwise.
LEO's and CBP may consider money contraband but thats their decision to make not ours. We have the authority to search your property at the checkpiont, LEO's do not. If I find drugs in a backpack I have to physically remove them from the backpack and hold them up to the LEO for inspection, he can't reach into the bag. So our organizations work together. If a TSO gets a passenger with a very large amount of cash in his bag flying internationaly, there is nothing preventing him from picking up the phone and letting the CBP know just in case this person has not delcared this cash. Kind of like if you see your neighbor beating his children you would call the police right? If someone is possibly doing something wrong that I can't do anything about shouldn't I contact a person who can do something? I do not like how the TSO and LEO's in that situation handled the man with the box of cash. But I do believe the TSO was using his training to believe that this man may be up to no good and I am going to inform the person who can find out and do something about it. --
TSOWilliamReed on PV
They work together: the left hand (TSA) does the limited administrative search, while the right hand (LEO) makes the decisions and takes the responsibility. With a collaboration like this, some SPOTted hung-over passenger could get his bag inspected down to the seams looking for anything that might be suspected of being a realistic replica of an IED component.