Link to article on the wealthy in Mexico implanting chips
in themselves so that they can be located via satellite in case of kidnapping. Even some middle-class people are opting for this.
If you find yourself "tied up in a safe house or stuffed in the trunk of a car", then I don't think a "preventive" measure like this will help. At least they can find your body, eh?
This is fear at work here, driving business. It would be far more effective to deal with the problem of crime, wouldn't it?