How do anti-theft alarms work in grocery stores?

Question

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?

In: 0

Answer 1

This is ELI5, so, magnetic field at the door arches, when a theft sticker that hasn’t been demagnetized goes through the arches they react with a beep

Checkstands have a magnet by the scanner usually that will deactivate it temporarily

edit: also, some stores manually add the tags to stuff, some items come with them.