With kidnappings spiraling out of control in Mexico and extensive evidence of police complicity, Mexico is apparently seeing rising demand for anti-kidnapping chips sold by a company called Xega. In essence, they’ll install an RFID chip under your arm so you can be tracked if kidnapped. This is, of course, not a foolproof solution as in one case “an armed gang invaded Fernandez’s home, sliced open his arm with a pair of scissors and extracted a satellite-enabled tracking device, leaving the chip and a streak of blood behind.”
Mexico’s combination of high inequality and high crime makes it a unique market for this kind of innovation, but I assume that over time we’ll see subdermal chip implants of various kinds used for a wider array of activities. I, personally, would love to be able to stop fumbling with various key fobs and brand loyalty cards.