I don't but that students were marked absent because they weren't in class. I just don't get how they can't be on time for 'home room' to say 'here' but show up for other classes where teachers, like at least one other, must take attendance. Between homeroom and other classes the school can't be bothered to change 'absent' to late/skipped class(es).
Beyond that knowing where people's children are is what I think parents expect. I'm not a parent but if I was I'd expect the school to do their job in educating my kids AND in providing their safety/security which a huge part of is knowing where they are.
I admit it would suck for kids when they are places they probably shouldn't be as a teen I often 'snuck' into rooms where I had a legitimate purpose but perhaps didn't have 'explicit' permission because there wasn't a teacher/faculty member to supervise me or others as we worked on projects or sometimes just goofed around. Had this kind of system been in place perhaps I would've gotten in trouble for that or been denied entry as doors unlock with the chips during certain times if the school could be bothered to let students be authorized for anything like that. The easy answer is ditch the chip somewhere but who knows how long that would be permitted to go on before the chip became your 'id' and without it you were marked absent/late/sent to the office etc to make you carry it all the time and not lose it or ditch it.
The other issue of course is how/when the chips are read, to be the 'safest' it should be a short range within the school probably a few feet to read them at doors. The chips should also only contain basic information to prevent either students or others from gaining private information from the chips.