I was skiing in Mammoth a few months ago and one day they disabled the automated readers on all the lifts and began manually checking the RFID lift ticket/cards. I suspected somebody had cloned a pass to save money for their group.
Yeah each pass will have a unique code for every user, if they find the same user entering multiple times in a short amount of time it will flag up. I gathered they use facial recognition too so if they see the same card with different faces it'll flag up as well. They don't fuck around.
(granted, facial recognition in a ski resort is uh. an interesting challenge)
