Mexico's Attorney General now has a non-removable microchip implanted in his arm to give him access to the countries crime database and track his movements. The device will be deactivated after he leaves office. I guess if someone kidnaps him now they'll be forced to cut off his arm to keep from being tracked.
In a similar move, although for different reasons, Japanese authorities in Osaka have decided to use RFID devices to tag school children. In this case, the devices will just be attached to uniforms and backpacks. I have to admit, I'd be willing to put them on my kids.