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Are cashiers required to check a credit card for a signature in the U.S.?
Per their merchant agreements, Visa and MasterCard say that the signature on the back of the card is the proper way to identify the card holder.  If a card is not signed, the merchant is supposed to check your ID and make you sign the card before accepting it for payment.  Merchants are not allowed the require an ID for paying with a signed card. Of course, store employees rarely know all these things.  Some will gladly accept an unsigned card.  Some will try to make you show your ID.