Bit overblown. Student has badge at school, which solely has an ID number in it. Student can take it off immediately after leaving the property, and put it in a faraday cage. It's not significantly different than an ID card with a barcode or magstrip.
This should be an argument if badges can be mandatory in a government facility. The RFID part is kinda misdirection.
Re the school in PA. Yes, U.S. Attorney's Office, the FBI and the Montgomery County District Attorney recommended no criminal charges. Because the pictures were taken automatically, and not manually. Yes, it annoyed us. On the plus side, the district got whacked with a $610k settlement and insurance companies scrambled to make sure future privacy-invasion claims will not be covered under policy. Lower Merion School District passed the buck onto the IT department. Pretty much every other school has put out policies forbidding remote video or picture capture.
Yes, criminal charges should have been filled at a minimum. For the encouragement of the others. But it probably would not have led to a conviction. But, it's been handled. I'd prefer "fear of prison sentence" instead of "fear of expensive lawsuit", but it's still a win.