credit cards are not legally valid unless they are signed on the back. if you try to use a credit card with "see ID" or whatever else on the back at a government institution, they are required to check your ID and make you sign the back of the card right there in order to process the card as payment. this rule is posted at all U.S. postal offices, secretary of state offices, and any other governmentally run office in the U.S.
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