Another possible hitch in finding the frequency is that the school may not have their own license, but instead be using one from a radio service provider that is renting them the air time and possibly the radios. That makes it quite a bit more difficult to find the frequency using a simple license search. It's also possible that the school may not understand that a license is needed and since their radios appear to have a preprogrammed set of frequencies may not have bothered to get a license to use them legally. In that situation (especially if they discovered that they may not be operating legally), they may change channels on a frequent basis in an attempt to avoid discovery either from the FCC or from others that may want to monitor their transmissions for some reason (someone that is monitoring to help them kidnap a student without getting caught for example).
The district likely has an FCC license (I found an expired one in the database, but I only looked quickly) but I'm not sure if that has anything to do with the actual individual buildings. There is a frequency in the RR database that might be for district wide security or school buses.
I noticed that the different buildings I'm in all use the same looking Kenwood, so the district likely bought a bunch and gave every building a certain number of them.
There's like 6 people that have a radio in the school where I work (security plus admins.) In elementary schools they don't even have security. It's just the principals, counselors, and maybe social workers that have a radio. They're just using the radios to for things like "we need to clear the hall on the second floor" or "what time is our meeting?"
As for the FCC issue, there's no way the school principals are even thinking about that where I work (likely not even aware of it). There's no way they're switching channels to avoid the FCC or possible outside monitoring.
