What damage will someone do? I guess you risk an occasional transaction you don&#x27;t know about. Someone can hardly hit 100&#x27;s of transactions quickly without flagging something. Also I&#x27;d be surprised if the banks don&#x27;t already&#x2F;shortly tie your location to the transaction as the swipe is increasing done from the phone (or they have your mobile banking app even if card based).<p>One thing I&#x27;m trying to change is get my partner to stop using a clone credit card they have of mine. It makes it hard for me to do my monthly scan of spending an know what what should&#x2F;shouldn&#x27;t be there.<p>Going forward I hope they get an e-ink screen on the card showing the last spend amount. I dislike when businesses swipe small transactions and you cant see the terminal amount. I generally ask for the receipt in these cases but having the most recent spend on the card would make things that little bit easier.