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Usually the store item has hidden within it somewhere a small magnetic or sensitive piece of tape which activates a scanner, or detector, located near the doorway. Thus when you leave the store with a stolen item, or leave the library with a book you wish to steal, the hidden sensitive tape activates the alarm system. Of course, some 'no-steal' devices are not at all hidden but very plainly obvious. These deter the shoplifter immediately.
All the devices are 'neutralized' at the check out counter and then the paid items no longer 'sound the alarm'. Shoplifting adds considerable to the cost of business and libraries suffer greatly from theft.

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Q: How do stolen items set off store alarms?
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