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At Walmart, or at least the one I worked at, every single case and jar of baby formula was tagged with a security strip that sets off the alarms at the door, on the inside of the container to make it difficult to remove. Baby formula was the most stolen item in the store. It's also one of the most expensive food items in the store.

Coincidentally, I would also find empty packaging with the security strip still attached in the handicap bathroom that was far away from the front doors and the alarm sensors.