Amazon Go

So what happens when someone asks a good samaritan to help them get some expensive item off of a high shelf? How does this deal with things like a couple shopping together, one with an Amazon account and one without where both of them are getting items off of the shelves?

Even if all of the video was monitored by a human I can still envision several pitfalls to this where it's hard to know who to bill for what without interacting with the customer.

People shopping with children would also be a big issue, it seems. Somehow it seems they will need to deal with the multiple-shopper case (no idea how to solve the "Have someone else get the item off the shelf for you" case).

See my theory above. There's no real inventory of your items until you walk out. What the vision system is doing is matching up your account (scanned upon entry) to the lane you choose when exiting (where the items are scanned).

So the food tags have disposable rfid/bluetooth enabled? Or the computer vision is to be able to scan the bar codes even when they're not visible? Any issue with the amount of radiation in that store?

That's my guess. RFID in the labels or packaging somewhere.

RFID radiation is no different than the radiation coming in and out of the phone in your pocket.