I think what happens with many processors who support dcc and want the merchnts to try to push it is when an out of country card is either swiped or dipped, as soon as the system recognizes the card's currency is not the local one, it prints a preliminary slip listing the amount in the currency of the card. This is supposed to be shown to the scamee to make his decision as to whether he wishes to be scammed or pay in local currency. What sometimes happens is, of course, the cashier simply fails to offer the choice and chooses for himself or herself that the sucker in front of him or her wishes to be scammed and has one of the lies all ready in case the scamee notices.