Thinking about it, my own experience also proves there's at least some aspect of it that's trust now. Mostly, I don't even put my shopping through the till scanner - I either use the hand held scanners they provide, or an app on my phone in the one shop I use that doesn't provide the hand held...
Interesting. Thanks.
I'll do an experiment next time I'm in. I'll scan a bread roll and deposit a bottle of wine and see if the alarm trips. I would have thought that they'd have sorted out the accuracy of weights and scales by now, but perhaps they've just left them turned off, as you suggest...
I've noticed a massive difference in the frequency of this happening, depending on which supermarket I shop in. In Morrisons, it happens every other item, in Sainsbury's about once every 6 items; in Waitrose, never. It's not happened, not once. I've even put an already loaded bag (loaded from...