Walmart near me has started using receipt checkers lately and they don’t even really do their job, it’s kind of a gimmick really. They just look at the receipt for a second Don’t even look at your cart, but they stop you every time. It’s just such a waste of my time when I’m in a hurry. I had one person even tell me that it was required by law. No it’s not! There’s no law in the USA that says they have to check your receipt.
Really depends on the person. Get a crotchety old guy and you may notice only certain people getting stopped. Or sometimes their tone obviously suggests you stole the groceries you just purchased, even though they have literally no authority or right to suggest such a thing. Or consider when I was ~12, a pedophile old man Walmart greeter tried to make moves on me. But that one might just be me.
The practice feels like/arguably is an accusation. From a multi-billion dollar corporation. When I legitimately bought this shit. Get out of my way.
I just say “no thanks!” and walk by. Our interaction is done once I’ve paid for my stuff. Want to check my receipt? Too bad, I get it on my phone and I’m not showing you my phone.