this post was submitted on 15 Jan 2024
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In the USA at least, any time you buy alcohol, tobacco, or any number of other random things that the retailer decides to flag as requiring ID, then you'll need assistance from a cashier. Random things include razor blades, compressed air, some herbal supplements, spray paint, butane torches, or any of dozens of other items. Any time you accidentally scan something twice, you'll need a cashier's assistance. Any time something rings up the wrong price or any time the UPC doesn't scan, you'll need a cashier's assistance. Also, if you're buying gift cards, you may need a cashier's assistance.
Also, different stores have different machines and different machines work better than others. Many places have ridiculously sensitive machines that freeze up if so much as a fruit fly farts on it. Some places use "AI cameras" to detect theft, which basically the algorithm for that seems to be "If (customer scanned something OR customer didn't scan something) then (theft, so freeze and call cashier for assistance)".
So, the frequency is highly variable. For some stores, I can usually manage to get by with almost never needing assistance. For others, it's practically every visit.
This is an important point. The execution of self-checkout seems to vary widely. I have only experienced poor executions like you described. I think a scan and go system sounds great and I would interested to see one tested at a shop in my area.