Don’t take your eyes off a clerk or an employee who is trying to run your card. Also, you shouldn’t let them walk away with your card either. If the clerk has an issue with your card not going through, be sure he or she returns your card right before they walk away. Don’t ever sign a blank receipt and put lines on any blank spaces before signing so nothing else can be added your total after you’ve signed your receipt.
Visit the ID Theft Authority at http://www.idtheftauthority.com/types/credit-card-theft/ to understand other ways your credit card can be compromised and possibly prevented.