I just saw a guy shove loads of chocolate bars and candy into a big black bag, get two beers. I got curious cause usually people don’t put stuff they intend to buy into bags.
Then he proceeds to checkout but only pays for the beers, not a single beep from the sensors. Are they only meant to detect certain items or did the homeless guy have something to disrupt the sensors?
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Sensors only sense the presence of specific anti theft devices;
the ones you usually notice are [these](https://www.labelstore.it/3657-large_default/placca-rigida-antitaccheggio-mini-hard-tag-completo-di-chiodo-1000-pz.jpg), but there are also more incospicuous ones like [these](https://cdn11.bigcommerce.com/s-1mowyqk6r/images/stencil/1280×1280/products/220/828/dpm-tapes-4×4-nr.2-rotoli-da-1000-etichette-antitaccheggio-rf-8.2-mhz-falso-barcode__30902.1659096317.jpg?c=1) and [these](https://www.antitaccheggioeuropeo.com/images/label-AM.jpg) that can be sticked on or even manifactured into some packaged items.
Unlike say a clothing store, a supermarked does’t usually tag all their items, but only the ones that are statistically more likely to be stolen, usually things that are both small and expensive, and dont’t bother with the rest of the merchandise, relying on the fact that people don’t know wich items are tagged or not or outright don’t know how anti theft works.
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