I'm sorry, Donjeta, I overlooked this post earlier.
1. In the Potter books, Hogwarts is considerably larger than an American elementary or middle school.
It doesn't matter, it could nevertheless be very convenient for a predatory school employee if they could figuratively prowl the corridors without leaving their desks and attracting undue attention.
2. Since when does a sexual predator depend on knowledge of large numbers of students rather then one, isolated and vulnerable victim?
If you're a lion you tend to have to scan the herd of zebras to
find the one zebra that is vulnerable.
3. If a predator depends on a computer read-out, he has no way of knowing whether a student is still in the place s/he was when the computer took its last reading. This is why the naked eye works better: it records info in real time and in close proximity.
If the pervert wants to get into actual contact with the child he would presumably have all the benefits of the naked eye at his disposal while he's getting there. In the meantime, having a virtual eye in the corridors could be useful for detecting opportunities since his actual proximity might be mostly expected to be at his work station with no isolated kids close at hand and if he kept constantly walking in the corridors trying to detect them with his magical naked eye and totally ignoring his work, his co-workers might take notice.
It depends on what the employee's tasks are. A janitor might find have an excuse to linger in the corridors but if an administrative employee or a principal spent a lot of time ijust walking around the school someone would wonder.
I agreed with you in another post that the results of such a scan should be kept confidential. But I still don't see how such a system will become a convenient tool for sexual predation.
It's perfectly fine that you don't. Maybe you just don't have a criminal mind. Hopefully it will not be a huge problem, and I am not saying it will be very often misused. But it could be if someone had the desire to. They need to install proper safeguards that alert if someone unauthorized attempts to access the data or if someone who has the right to access the data seems to access it in a deviant pattern.
Hopefully they're for the most part successful in doing background checks and keeping the perverts out of the school systems either way because they have no place to be there, badges or no badges.
Mostly I just think that personal checks involving an actual person who knows the children and sees what the children are doing is absolutely necessary anyway so it makes no sense to me that it's presented as an advantage of the badges that the teachers don't have to spend their time on this any more.
Big Brother watching doesn't worry me, I totally hope and expect that my little ones are watched when they're at school anyway.