RFID stickers could signal contaminated food
If a food item isn't safe to eat, it's best to find that out before someone eats it. MIT researchers have found a way to check many items instantly, non-invasively and from a distance — using the RFID tags many products already have. RFID, or radio frequency identification, uses a tiny antenna embedded in a sticker or label that's activated and powered by radio waves at a very specific frequency.