In my experience, self-checkout started with the weight sensors, rather than adding them later. I've noticed some stores have a system now without the weight thing, which probably cuts down on confusing and time-consuming error situations, but it makes it seem chaotic. My parents use them in the most fucked up way - leave everything in the cart, scan stuff, bag it, then put it in the cart, and I'm just WHAT? Aren't they going to accuse you of stealing? Some walmarts aggressively pursue claims of theft from self checkout, like in the case of this lady who was awarded 2.1 million after being accused of stealing, which she said was not true. This article details the story of a lady who said she was arrested after not scanning things by accident, and the article notes "Sixty-two other people were cited and released by police at the same Tucson Walmart between January 2021 and April 2022."

During the civil trial, which lasted about three weeks, the judge criticized Walmart for the “intentional loss” of the security camera footage, according to court records. The judge, James T. Patterson, said that the court would advise the jury that the videotapes “were destroyed by the defendants with the intent” to deprive the plaintiff of the benefit of seeing them “and that the jury therefore is to presume that the content of the missing videos would be adverse” to the defendants.

Walmart also is starting to use 'AI' to detect self checkout theft, which I'm sure will be foolproof and work out great.

And if you're wondering which item causes the most problems, it's milk. O'Herlihy explains, "People find it hard to scan milk ... Sometimes they get frustrated and they just don't scan it."

What?

Anyway, I'm sure they love not paying employees to do this, but it seems like more trouble than it's worth.