[dandr01d]

1. Scan your personal barcode with your phone when you walk in. Camera associates your physical self with your code.

2. Cameras track every item you pick up.

3. Cameras note when you leave the store and charge you.

[ajeet_dhaliwal]

Do you know this for sure or is it a guess? I was wondering if it might be your phone proximity to the items for a period of time but I guess that would be easy to tamper with.