People tend to forget that courts exist. Just because kids have their school ID cards doesn't mean that the police can (or will ever be allowed to) ask for them

People tend to forget that courts exist. Just because kids have their school ID cards doesn't mean that the police can (or will ever be allowed to) ask for them and check for the validity (sounds like a warrantless search). Your nightmare scenario is blocked by the fact that just because something is technologically possible, it doesn't mean the police are allowed to do it. This adult ID card you speak of? What will be the rationale for it existing? haven't national ID cards been pretty much decided to be unconstitutional? Not an expert but doesn't RFID have a really small range too? All RFID-ish cards I have seem to require being around 50cm to the reader, so if the police drove down my street, they won't be able to get my arcade card info, much less my subway pass (granted they could just get that from the transport company). On this situation, these cards seemed to be for attendance only. If the cards were replaced by people doing attendance at every door in the school, we'd probably be complaining about the fact that high-tech solutions to this problem exist.