Originally Posted by
RichardKenner
I disagree. "probable cause" means probable cause that a crime has been committed. Seeing $20,000 of cash on a person traveling internationally says nothing about whether that person filed the proper form or not and you don't have "probable cause" to question about that money unless you have some evidence that the form wasn't submitted. Otherwise, you have what's known as a "fishing expedition", which is quite illegal.
I will leave it to the lawyers (like
PTravel) to correct me if I am wrong, but it is my belief that having filed an FinCen Form 105 is the same as having a valid driving license.
If a police officer sees me driving, he has the right to demand that I show my license. Likewise, if he sees me with a large amount of money, which is obviously above $10,000 and knows that I have entered the country or am on my way out of it, he can demand to see the FinCen Form 105.