Stupid question of the day

[NotMitch]

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Whenever I buy something with a credit card, the cashier looks at the back of my card for my signature. The thing is, I don't sign my cards and the cashier doesn't ask me for ID and swipes the card anyway. So, my question is, why do they even look at the back of the card?

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If you read the T&C from you CC company the card is not valid without your signature. Althought clearly in the real world it doesnt work that way.