You are unsure if a guest’s ID is valid. What is the best way to double check?

Asking the guest to tell you the address on the ID is a good way to check if they are trying to use a fake. Fake addresses, unlike last names, are difficult to memorize and recite on the spot, and hesitation may clue you in to a counterfeit. Eye color is too broad a trait to help distinguish if an ID is fake, and donor registration status may or may not be present on even genuine state IDs. And remember- if you sincerely doubt the validity of an ID and the guest’s stated age even after a double check, you always have the right to refuse to serve alcohol to a minor.