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you have to put the item on the scale before it lets yo uscan the next item. So you can scan the same item twice if you scan it once, put the other item on the scale, and scan the item again.

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My go-to grocery store does not use a scale in the bagging area. You don't even have to bag anything, you can just scan items and put them back in your cart, which is what I normally do. There is one employee standing there monitoring 7 or 8 self-checkouts, but they've never confronted me about allegedly not scanning something, and I've never heard them confronting anyone else.

Another nearby mega-chain still uses the scales and makes you bag every item before you can scan anything else. I don't ever shop there, almost entirely for that reason alone. I would definitely never knowingly shop at a store that was scanning my face and storing it in a database.

Not necessarily. In my case I will often buy a few bunches of bananas, which don't all fit on the scanner’s scale at once. If I try to weigh them once bunch at a time, I will get a “too many scans of this item” alert and a staff member will have to come unlock the machine for me (and they'll usually scold me for not weighing all of my bananas, which can't all fit on the scale, at once).

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