And they appeared because they have been tagged with some RFID device they haven't been smart enough either to not have it put in in the first place or to have it removed by a doctor?
I don't know about you, but I don't think anyone in their right mind (apart from Mexican politicians) would really want to have tatooes on their arms/embedded RFID devices in them.
And if smart crooks knew they were being tracked by their mobile phones you think they would be smart enough not to bring them to a place they decide to rob.
You explain how the situation is asymmetrical, which would mean the grandparent wouldn't be happy with it. There's no conflict here; I think we understand the impracticality of the suggestion.
I don't know about you, but I don't think anyone in their right mind (apart from Mexican politicians) would really want to have tatooes on their arms/embedded RFID devices in them.
And if smart crooks knew they were being tracked by their mobile phones you think they would be smart enough not to bring them to a place they decide to rob.