Reminds me of the invisible fencing where it keeps your dog in the yard but every other dog who has no "collar" now has access to your dog. Likewise, what would keep someone from stealing Whole Foods blind when they walk out with merchandise and had no card on them? If anyone can answer me this I'd appreciate it.
It’s the modern world. IBM has been promising that for over a decade. I believe the solution is everybody has a card or a phone. Even bums have cellphones these days.