Many problems have a technical solution. A company I used to work for got a new CEO who was convinced that personal use of the copiers was a large problem. Everyone was issued copier cards, so that everyone's copy use could be measured.
Someone reprogrammed his own card, and those of many others. It then appeared that the CEO was making an astounding number of copies, and the program was dropped.
Those kids will be wearing fake tags within a week, with the real ones carried by others. More technically challenging solutions may arise. That may be the real reason for the experiment; to encourage electronic experimentation by the students, and to make the inventor of suceesful countermeasures popular. Anyone else know how to make electronics cool? That principal is a genius, or else an idiot who achieves the same result as a genius. That happens sometimes.