[Salgat]

At least in Walmart I've had workers come over to me multiple times to verify I correctly scanned things. There's definitely more scrutiny involved when you have a centralized self-checkout (this only happens in the more sketchy Walmart, the nicer one seems to trust people more).

[bombcar]

It's entirely a sketchy/nice dichotomy (though the local nice grocery store is tuned too damn high, I avoid that one).