Originally Posted by
Trollkiller
Sorry dude you misread the instructions. You don't mail when you are carrying the cash only if you received the money or are mailing/shipping the money.
From
FINCEN Form 105 (PDF Warning)
I'd love to see an attempted prosecution for dropping the form in the mail instead of filing it at the airport. I'd say the words "dismissed with prejudice" would figure in there somewhere.