There's already an scale that prints UPCs in the produce department for customers to use. I'll just put the package of steak on there, punch in 4011, and scan out my "bananas" at the self-checkout. ;)
(But they'll still know who I am. Walking out is cleaner, and has fewer steps.)
Honestly if you’re a thief this is just a dumb idea. Probably works for the original commenter a few times fine. But it’s way too obviously and intentionally theft. You need to come up with something you can claim was an honest mistake.
Find another item that sounds similar but is cheaper and use that upc. If you’re keying in the upc, on a scale or something, then find one that’s cheaper but off my 1 digit or something where you can say it was a typo and you didn’t notice. Those kinds of things are more defensible. None of us have been trained to be a cashier so honest mistakes are a strong defense to any claim of misconduct.
That said: I've never, ever weighed meat at self checkout. In fact, I've never had a cashier any weigh meat, either.
I've bought plenty of steaks in regular grocery stores, but each of those steaks (even the ones that they wrapped in butcher paper just for me after I selected them from the glass case at the back of the store) had the weight coded into the UPC that was printed at the time it was wrapped up (and weighed by the meat cutter).
There has no further weighing required for the register to know the price, so weighing a steak at the checkout is pretty bizarro-world behavior to begin with -- at least in my experience.
https://en.wikipedia.org/wiki/Universal_Product_Code#Number_...