Meh, if you look A LOT like the other person, it would work.
A buddy of mine always gets the Loveland pass, but rides a few days a year in Summit using his brother's Epic Pass, but they look A LOT alike.
But, another buddy of mine got busted using someone else's pass. Luckily he was smart enough to carry $50 cash on him that day in case he had to buy off a liftie. Worked like a charm.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz