I think what you're talking about is a one-day complimentary voucher, which employees usually receive. In the past, I have used other people's (you go to the guest relations window before you enter the park and exchange it for an actual one-day pass). However, I haven't done this for a while, and it is conceivable that Disney is actually checking IDs now to see if you match the name on the voucher because they are using the biometric scanning for passes other than the annual passes at this time. You really won't know until you try.