It came to my attention quite a while ago that supermarkets have started putting electronic tags on joints of meat. I discovered it when I set the store alarm off when leaving Tesco only to find that a joint of meat I had purchased from the reduced section had an electronic tag still attached to it. It appears from this article that as prices go up more supermarkets are putting tags on meat because they are starting to have an increased problem with theft. In some cases it appears that people are stealing joint of meat and large packs of bacon to order but there is also evidence that there is an increase in people stealing food to eat themselves.
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