I can't say I'm surprised. It's easy to work out what shops don't have it as they sometimes block mobile phone signals and your phone doesn't get a signal in the store. Many supermarkets track you via the chip in their loyalty card as you walk through the entrance.
this is getting all a bit creepy, i didn't know that about the chip in the loyalty card.
i didn't know that about the signal blocking either, so when we hear that prison inmates are continuing their practices and/or arranging for things to be smuggled in by using their mobile phones, then the authorities are failing to block the signal.
The loyalty card chip clocks how often you visit the store and how long you spend in there. When you pay for your shopping it knows exactly what you have bought and if you are signed up for e mails, will notify you when items you frequently buy are on special offer and also tailor your extra point vouchers which are sent to you accordingly.
Each swipe of the card sends what you bought, where and how you paid for it into a databank profile of your purchase history, along with the personal information you gave when you signed up for the card.
The researchers are planning to further refine the non-invasive glucose test into a continuous monitoring sensor for use in clinical care settings. The device comprises a fiberoptic cable connected to a wristband which passes laser light onto the skin. This detects various components such as fat tissue, protein, collagen and glucose molecules.