I have indeed seen the DMT force or something similar to that before live.
He basically spread the cards on the table, made me pick a card and put it back.
Then he shuffled and spread the same deck of cards again on the table.
And sure enough i picked the same card as i did previously. This was not those one way decks or gaff decks, because I flipped all the cards over afterwards and it was just a regular deck of bikes.
As for how he did it..i have no idea