How do anti-theft alarms work in grocery stores?

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I know that clothing stores items usually have some kind of RFID tags in them. But what about food items in grocery stores, say, a carton of milk? Are tags still embedded in them?

I’ve also read that scanning a barcode esentially deactivates the tag inside. But wouldn’t that mean that people can scan items and then not pay without setting the alarms off?

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> I know that clothing stores items usually have some kind of RFID tags in them. But what about food items in grocery stores, say, a carton of milk? Are tags still embedded in them?

For the most part, grocery stores don’t have anti-theft tags on/in their items. So, when there’s a detector at the door, it’s just for show.

> I’ve also read that scanning a barcode esentially deactivates the tag inside. But wouldn’t that mean that people can scan items and then not pay without setting the alarms off?

Whoever wrote that scanning a barcode deactivates the anti-theft tag was pants-on-head wrong.

A barcode exists for the sole purpose of identifying the product in store databases. It has nothing to do with the anti-theft tags.

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