Related...some stores have started entering the last 4 digits of the credit card into their POS. This will work even if the card is flat and is obviously used t

Related...some stores have started entering the last 4 digits of the credit card into their POS. This will work even if the card is flat and is obviously used to verify that the card number encoded on the mag strip is the same as the one on the face of the card. If this becomes more widespread coin will have problems.