I usually put my wallet over the touchpad to block it. Maybe I'll mess up on the PIN, too, to throw people off (although that's probably caused by not being ab

I usually put my wallet over the touchpad to block it. Maybe I'll mess up on the PIN, too, to throw people off (although that's probably caused by not being able to see the numbers). They could also use sound to detect the keypress, but I'm hoping any legit retailer hasn't gone that far, yet.