Grocery Store Scanners May Not Be Created Equal

Prices may not be properly calculated every time an item is scanned into the system.
2:48 | 09/08/14

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Transcript for Grocery Store Scanners May Not Be Created Equal
We're back with "Gma" invest dpats supermarket scanners. You figure the price is right. That's not always the case. Mara schiavocampo spoke with victims of overcharging. Reporter: Supermarket scanners. The cost of food may be eating up your budget. Jst last year, we did over 1300 investigations of supermarkets. Over half the time, we found violations. Reporter: "Gma" investigates followed an undercover inspector from the department of consumer affairs in New York on two separate days. Where would I find the smuker's jam? Reporter: During unannounced grocery store visits. The inspector choosing items at random. At the check out, he identified himself. I actually work for the city. Reporter: Of the fife stores we visited, four received violations. At one store, this olive oil -- A ten-cent overcharge. Reporter: Someone might say it's just ten cents. Sit a big deal? It is. That's happening week in and week out. Reporter: A common violation, charging for the container at the deli counter. Which is supposed to be free. For this coleslaw, the overcharge of $12 sents. You're going to pay $2.99 per pound. That's for the product only. Reporter: Another common violation. Charging tax on items that should be tax-exempt. In New York, pain medication, most food, fruit juices and unsweetened drinks. If it's not sweetened or carbonated, you can't charge tax on that. Reporter: Authorities are cracking down across the country. In June, whole foods agreed to pay $800,000 in fines and penalties in California after state investigators found the chain charged more than the advertised price on my items. Whole foods told ABC news it takes our obligations to our customers very seriously. We will continue to refine and implement additional processes to minimize such error going forward. Several other national chance have paid similar fines or settlements in recent years. In cases brought by state authorities involving overcharges. Back undercover at another store, four violations. Adding a whopping $13.08 to the $114 bill. An increase of more than 10%. For "Good morning America," Mara schiavocampo, ABC news, new York. We should say one store undercharged for two items. Sometimes things are just mistakes. That happens. And coming up, the latest on

This transcript has been automatically generated and may not be 100% accurate.

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